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Old 01-29-22, 05:52 AM   #5206
LUKNER
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Default Attack group ASW ships at night without fog.








Do not joke with destroyers, they are very angry and apt!


Не шутите с эсминцами, они бывают очень злые и меткие!
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Old 01-29-22, 10:08 AM   #5207
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Originally Posted by LUKNER View Post







Do not joke with destroyers, they are very angry and apt!


Не шутите с эсминцами, они бывают очень злые и меткие!

Enjoyed the video as always.
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Old 01-29-22, 03:07 PM   #5208
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Default USS Nautilus SS-168 War Patrol Two 30 January-17 March 1942

(TMO 2.5 Update BH V2.0 (2.0soon to be released)
Donation Narwhal mod
100 difficult, cams and contacts off. )


War Patrol Report
USS Nautilus SS-168
War Patrol TWO
30 January-17 March 1942
Area 4

PROLOGUE

Returned from first war patrol on 16 January 1942. Repairs made, provisions loaded, including twenty four MK 14 torpedoes.SD Air Search Radar installed on 27-28 January and tested. Ready for sea 29 January 1942.


NARRATIVE

Departed Submarine Base Pearl Harbor, T.H. at 0900 on 30 January for Area 4 in the Japanese Home Islands via Midway. Conducted dive, torpedo fire control, emergency, and gunnery drills en route.

Arrived Midway at 0830 3 February 1942 and docked at submarine tender. Fuel and provisions topped off, departed Midway at 1400 hours. Turned to course 270 at 10 knots until nightfall, turned to course 280 at 10 knots.


Maintained standard underway routine en route to patrol area, with daily trim dive from 0700-730 each day from 4 February until 11 February. At 1000 on 11 February, NAUTLIUS picked up a SD contact at 8 NM closing and submerged to avoid. Position was roughly 32-30 N 154-40 E, 530 NM N of Marcus Island, and thus it is believed the contact was a patrol aircraft from Marcus Island. Remained submerged until 1930, surfaced and continued on course 280.


Beginning at 0730 on 12 February, daily routine was to submerge in daylight as NAUTILUS was now within range of patrol aircraft from various locations. Typical submerged speed was 3.5 knots on course 280. A depth of 90 feet was maintained, with ventures to periscope depth for observation every half hour, and a vigilant sound watch was maintained as well.


Arrived in Area 4 at 0000 17 February and began standard operations, submerging at daylight and surfacing just after dusk. Patrol depth was 100 ft with periscope observations every half hour and sound watch maintained.

Each day at least two large flying boat types, believed to be H6K were observed. Multiple motor powered fishing boats were observed and avoided in daylight.

However, at 0200 on 20 February, two of these boats were spotted just 4000 yards off port bow. BATTLE SURFACE-GUN ACTION was called. At 0211, commenced firing on two fishing boats, estimated 200 tons each, from 2000 yards. Machine gun fire was returned from the lead boat, but was quickly silenced by two hits from six inch deck gun and multiple .50 cal machine guns hits. Ceased fire at 0214, as both ships were burning and adrift. Secured General Quarters and resumed course 000, arriving off the entrance to Sagami Way before dawn. NAUTILUS submerged just before dawn patrol, in hopes to interdict traffic coming and going from Tokyo Bay.

At 1131, spotted smoke of AK on course 180 in Sagami Wan. NAUTILUS went to GENERAL QUARTERS-TORPEDO and began approach on course 270. A low flying, twin engine flying boat (H6K) flew over, requiring NAUTILUS to submerged to 100 feet to avoid being spotted in the calm, glassy morning seas. The flying boat, likely on her way out for morning patrol, showed no signs of detecting NAUTILUS. Back at periscope depth, identified the AK as the 7590 ton AK ,DAITOKU MARU on course 170 at 9 knots. NAUTILUS continued to close at 3.5 knots. At 1158 periscope observation, the AK was observed turning to course 280, ruining the set approach. Increased speed and attempted to save the attack, but was unable. Enemy air and surface patrols and close proximity to shore prevented further pursuit. NAUTILUS went to 100 feet and secured from GQ.


At 1700, sound reported fast screws bearing 160. NAUTILUS went to periscope depth and observed a DD at estimated 7000 yards, closing on course 005. The ASASHIO Class Destroyer, was apparently heading for Tokyo Bay. Luck of proper position at contact provided ideal set up., and thus GENERAL QUARTERS-TORPEDO was ordered. Approach was made on course 090 at 3 knots. Enemy DD on course 005 at 16 knots. NAUTILUS closed to 1000 yards off the enemy's track. (TORPEDO ATTACK NO.2) At 1718, fired three MK 14 torpedoes from tubes 1,2,3 on ideal track, one that seemed could not miss.

At 1718:20, loud explosion, torpedo detonation was heard. Apparent that the first torpedo prematurely detonated twenty seconds after launch. Periscope was raised and observed DD slowing and changing course as they detonation apparently alerted the DD. The second torpedo appeared that it would hit, but the wake was observed running below target just aft of amidships, likely a "deep runner."

Finally, the third torpedo missed just ahead of the bow perhaps by twenty feet or less as DD expertly maneuvered. DD then made a high speed turn, with one bow torpedo left in tube four, fired a "down the throat" shot from 600 yards and ordered a depth of 200 feet. A large torpedo explosion was heard as passed 85 feet, but believe was another premature explosion, not a hit. DD roared above, dropping four depth charges in close succession, shaking the boat.


Over the course of the next eleven and half hours, the DD hunted NAUTILUS making numerous attacks. (See ANTI-SUBMARINE TACTICS AND EVASION Section) . One particular attack came after two hours of silence, when DD suddenly rushed in pinging. NAUTILUS at 300 feet, rigged for silent running and depth charge, began a slow turn to port, and increased to standard speed for a "burst" of speed as DD roared above. Five splashes were audible as depth charges hit the water. Two detonated, slightly shaking the boat, but not close. After several seconds of silence, a loud , "CLANG" was heard, apparently the sound of a depth charge bouncing off the hull, aft of conning tower. Twelve seconds later, the depth charge exploded, shaking the boat but not damage reported.

Finally, contact was last with the destroyer. NAUTILUS secured GQ, but remained at 300 ft and under Silent Running and Depth Charge conditions until 2300 hours when came to periscope depth. All cleared, NAUTILUS surfaced into the fresh area.

NAUTILUS proceeded to western sector of Area 4 and submerged off Suruga Wan at dawn 21 February for patrol. No contacts were made and surfaced at 2200 hours, proceeding back to eastern portion of area off Chiba Peninsula.

During the morning trim dive at 0900( local) on 22 February, sound detected faint prop noises bearing 075. Turned to course 075 at 5 knots to investigate. By 0930, noise was strongly believed to be a merchant type vessel, but distance was not closing at rate desired, indicating vessel was heading away from NAUTILUS. Thus, after a careful SD sweep, surfaced at 0955 on course 080 at flank speed.

At 1016, lookouts spotted smoke of large AK on horizon bearing 354. NAUTILUS came about to parallel contact, pull ahead for dive and approach for attack. At 1024 SD detected a contact at nine miles, closing fast. Ordered a dive to 100 feet. NAUTILUS returned to periscope depth at 1045, extended the SD antenna for a sweep with no contact. The contacted vessel's smoke plume was visible in the light morning haze bearing 100. NAUTILUS surfaced at 1100 and went ahead flank.


At 1135, NAUTILUS submerged for approach and attack and GENERAL QUARTERS-TORPEDO was called. At 1150, identified the contact as a tanker of the ANJO MARU Class, 2,800 tons on course 030 at 9.5 knots. NAUTILUS
conducted a classic submerged approach at 3.5 knots and readied all four bow tubes, torpedo depth set to 15 feet, as target was believed to have draft of 14 feet. (TORPEDO ATTACK NO.2) At 1200 NAUTILUS fired tube No.1 from 1000 yards. Torpedo ran true and exploded beneath the keel. The tanker was likely empty of volatile fuel cargo was it did not explode was expected, but did lose its way, and sound confirmed engine noises ceased. After fifteen minutes, the stubborn little AO has not sunk, ordered Tube No.2 fired at 1215. Eleven seconds after firing and just yards from target, torpedo prematurely detonated, confirmed visually and acoustically. At 1217 fired tube No.3 and at 1217:44, observed torpedo impact side of vessel, but fail to explode. The "clang" of the impact was audible via sound gear and throughout the hull of NAUTILUS. At 1218 fired tube No.4, which veered off to port, suffering a possible gyro failure. Ordered immediate turn to port to bring stern tubes to bear on target.


At 1233, fired Tube No. 5, observed wake pass below target without detonation. Fired Tube No. 6 which again, detonated just yards from target, but after passing below target. With no desire to waste anymore torpedoes before could be checked out, nor to wait for enemy vessels in area to arrive, NAUTILUS surfaced for BATTLE SURFACE-GUN ACTION at 1246. Upon surfacing, immediately opened from 3500 yards on the unarmed tanker. Gun accuracy was excellent and effective as tanker was soon burning and at 1255, guns ceased fire as tanker settled in water. At 1300, fired four more rounds from each six inch gun at waterline, which finished off the tanker. ANYJO MARU 2800 tons sunk 1321 hours at 34-53N 141-14E 22 February. Two life boats were spotted as NAUTILUS cleared the area at flank speed and secured from GQ.

SD radar contacted was detected at 1342 hours, NAUTILUS submerged to avoid and remained so for rest of the day, surfacing at 2200 (local).

Patrol of the area on 23-27 February brought no contacts, other than daily patrol aircraft. However, at 0200 on 28 February, lookouts spotted the silhouette of a ship on the horizon at bearing 065. Contact was tentatively identified as a AK of 5000+ tons. Low visibility necessitated a shadowing before attacking submerged at dawn. NAUTILUS matched course 030 at 9 knots of next few hours. Finally at 0915 local, with the AK astern, NAUTILUS submerged for attack. GENERAL QUARTERS-TORPEDO was called and approach was conducted on course 095 at 4 knots. Upon observation at 0936, it was revealed target had slightly course course. NAUTILUS compensated for this by speeding up to 6 knots to close range. Upon next observation, set up was ideal. Target was identified as AK of the KENJYO MARU Class, 7,627 tons. Tubes 1,2,3,4 made ready for firing. Torpedo No.1 was set to a depth of 25 feet, as target draft was 24 feet. Torpedo No. 2 was set to ten feet, aiming to take advantage of the backup contact exploder. A keel shot and side impact on such a large ship was believed to be best solution for sinking.

(TORPEDO ATTACK NO.4) At 0951, fired tubes 1,2, from 1000 yards, AOB 90, ideal track. Just after raising scope, observed Torpedo No.1, at 20 feet or less from target, prematurely detonate. Torpedo No.2 hit target right under stack, causing a large explosion, likely of the boilers. Ship went dead in water, sound reported engine noises ceased. At 0954, fired tube 3 , set for depth of 25 feet. Torpedo wake again observed passing below target. Fired tube 4, set to depth of 5 feet. Torpedo hit as aimed, but failed to detonate. The audible "clang" of the impact of the torpedo with target hull was audible aboard NAUTILUS and on sound gear. With forward tubes empty, turned NAUTILUS to bring stern tubes to bear, while forward tubes were reloaded.

Tubes 5,6 and were fired, on minimum depth setting from 800 yards at ten second intervals. Both torpedoes prematurely exploded en route to target. NAUTILUS again turned to bring bow tubes to bear as last three bow torpedoes were loaded into tubes. Tubes 2 and 3 were fired at 1041 hours, torpedo 2 prematurely detonated less than 10 yards from target, after passing below the keel. Torpedo 3, set to minimum depth, ran true and exploded, just forward of the amidships, starting a fire.

However, the large AK refused to sink. Fired tube 4 (final bow torpedo) which after launch, jogged to starboard, before going into a circular run. NAUTILUS, as it did when experienced this malfunction on War Patrol One, went to 100 feet and waited until torpedo reached its end of run.

Back at periscope depth, with stern tubes brought to bear, fired final two stern torpedoes, set for minimum depth from 700 yards. Both torpedoes hit as aimed, but failed to detonate, the clang again clearly audible through hull and on sound. NAUTILUS, out of torpedoes opened the range.

After some contemplation, decided to open range to 6000 yards and utilize the six inch deck guns. The KENJO MARU was heavily armed with what happened to be four inch guns in the bow and stern. However, the risk was considered worth the reward, for this was a large important cargo vessel.


NAUTILUS went to 100 feet and passed below the AK and opened range to 6000 yards. BATTLE SURFACE-GUN ACTION was called at 1120 and after a SD sweep , NAUTILUS surfaced parallel to the target. At 1122, NAUTILUS opened fire with fore and aft deck guns from 6200 yards off targets starboard side. Target returned fire, with a few shell splashes observed in our vicinity but not close. Thirteen hits from NAUTILUS's six inch guns, left the AK burning and sinking, when suddenly a large explosion happened Four minutes after last six inch gun hit. The AK split into two sections at amidships. KENJO MARU 7627 tons sunk at 34-20N 140-10E, 1159 hours.


NAUTILUS submerged at 1204 for SD contact at 8 miles and remained so for rest of day due to heavy enemy ASW air and surface activity in area. Surfaced at 2230 and set course for Pearl Harbor, as all torpedoes were expended. NAUTILUS proceeding at 10 knots had enough fuel to make Pearl Harbor and did not stop at Midway en route. On the morning of 17 March, 1942, NAUTILUS arrived Submarine Base, Pearl Harbor, T.H. and terminated war patrol.


ATTACKS

Three torpedo and the gunnery actions occurred on this patrol. Twenty torpedoes were fired, for four hits. Several "can't miss" shots were in facted missed, due to repeated torpedo malfunctions. Malfunctions include premature detonation of torpedoes before reaching the target, failure to detonate when impacting the target, running deeper than set and thus running too far below target, failing to actuate the magnetic exploder, apparent gyro failures, and circular run. These failures, aside from serving as a source of great frustration, put NAUTILUS and her crew in grave danger. Failures in Attack No.1 led to NAUTILUS enduring a eleven and half hour counter attack. The circular run Attack No. 3 presented grave danger as well.

Gunnery performance, of both crew and equipment was excellent and finished off both vessels damaged by torpedoes that managed to work. A total of 52 6' 53 caliber shells were expended for 36 confirmed hits.

SHIPS SUNK

AO ANJO MARU
2800 tons
1942-02-22 1321
34-53N 141-14E
Sunk by torpedo and gunfire

AK KENJO MARU
1942-02-28 1159
34-20N 140-10E
Sunk by torpedo and gunfire.


Fishing Boat #1 (Armed)
200 tons
1942-02-20 0215
34-34N 139-46E
Sunk by gunfire

Fishing Boat #2
200 tons
1942-02-20 0215
Sunk by gunfire
34-34N 139-46E

Contacted and/or Attacked (Not Damaged)

DD Asashio
1200 tons
1942-02-20 1700
35-3N 139-44E


NAVIGATIONAL AIDS

Cape Taibusa, Boso Peninula and Oshima Island aided in navigation
while in patrol area.



AIRCRAFT CONTACTED

Multiple twin engine patrol planes, believed to be H6K type were observed in patrol area. Enemy patrols the Tokyo area and offshore fairly extensively with aircraft and armed picket vessels, such as fishing boats sunk on 20 February.



ANTI-SUBMARINE COUNTERMEASURES AND EVASION


Enemy aircraft appear to form the backbone of ASW patrol in Area 4, along with pickets. However, it is believed area is patrolled by Destroyers on a regular basis.


The depth charge attack of 20 February was intense, persistent, and accurate. Pinging of active sonar was dominant through attack, enemy did go silent for periods of time to listen for contact. Enemy sonar effectiveness appeared to wane once NAUTILUS reached 250 feet. Although, their persistence allowed apparent intermittent contact, resulting a prolonged pursuit.

Should be noted that most depth charges appeared to be set too shallow to do more than rattle the boat and crew, with the exception of one lucky charge, which bounced off the aft deck. The audible "CLANG" which broke the silence, was a bit disconcerting. The charge exploded about eleven seconds after bouncing off the deck, shaking the boat.


Evasion was conducted by silent running, with frequent course changes. Initial depth for evasion was 150 feet, working down to 300 feet. Speed "bursts" were used as required when enemy passed above or close aboard.


MAJOR DEFECTS AND DAMAGE


Depth charge attack of 20 February caused minor damage. All damage repaired at sea unless otherwise indicated.


1. Trim Pump

2. Hydraulic Pump

3. Piping Leaks

4. High Pressure Air Line Leaks

5.Busted light bulbs-All compartments

6. Aft Battery


RADAR

SD Air Search Radar performed well with typical detection range of eight nautical miles.



SOUND CONDITIONS AND SOUND GEAR

Sound conditions were general mediocre throughout the patrol area.

Sound gear functioned above average considering conditions.


THERMAL LAYERS

Thermal Layers were detected at 200 and 160 feet.


RADIO

Radio performance was normal throughout patrol.


PERSONNEL

Crew performance was excellent throughout patrol, even under trying conditions such as the prolonged depth charge attack of 20 February and repeated torpedo failures.

Eight men and two Officers qualified on this patrol.



HEALTH AND HABITABILITY

Crew health was overall satisfactory. Three delayed cases of venereal disease arose shortly after departing Midway, likely acquired from last shore leave following first patrol. Cases were successfully treated.

Conditions aboard the boat remained overall satisfactory with well prepared meals, mostly calm sea conditions, and overall favorable weather.


MILES STEAMED/FUEL CONSUMED


Pearl Harbor-Midway
Miles 1,325
Gallons 20,244

Midway-Area
Miles 2,750
Gallons 40,650


In Area
Miles 5,250
Gallons 55,221


Area-Pearl
Miles 4095
Gallons 52,288


DURATION

DAYS

Pearl-Midway 4

Midway-Area 14

In Area 11

Area-Pearl 17



FACTORS IN ENDURANCE


FUEL 11,554 gallons

TORPEDOES 0

PROVISIONS 29 days

PERSONNEL Indefinite

Reason for Termination of Patrol- All Torpedoes Expended



REMARKS


A successful patrol with a tanker and large merchant sunk, plus two fishing boats for a total of 10, 827 tons tons. While proud of this accomplishment, results of patrol could have been better with more time on station, but this was preempted by repeated torpedo malfunctions and thus it is sincerely hoped this issues are resolved as soon as possible.



J.P. Thew, CDR, USN.
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Old 01-29-22, 11:06 PM   #5209
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Quote:
Originally Posted by Bubblehead1980 View Post
(TMO 2.5 Update BH V2.0 (2.0soon to be released)
Donation Narwhal mod
100 difficult, cams and contacts off. )


War Patrol Report
USS Nautilus SS-168
War Patrol TWO
30 January-17 March 1942
Area 4
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Old 01-30-22, 04:49 PM   #5210
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Quote:
Originally Posted by Bubblehead1980 View Post
(TMO 2.5 Update BH V2.0 (2.0soon to be released)
Donation Narwhal mod
100 difficult, cams and contacts off. )


War Patrol Report
USS Nautilus SS-168
War Patrol TWO
30 January-17 March 1942
Area 4

Great, as usual !
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Old 01-31-22, 02:12 PM   #5211
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Great, as usual !
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Old 02-02-22, 07:17 PM   #5212
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Default USS NAUTILUS War Patrol THREE 24 May-14 July 1942

TMO Update BH V 2.0 (2.0 in testing process, not yet released)
Donation Narwhal from Subsim+TMO Upgrade Package (oack not yet released
100 difficulty
Cams, Contacts, left on, plus next/prev cam restored for this patrol for testing Battle of Midway.


War Patrol Report
USS Nautilus SS-168
War Patrol Three
24 May-14 July 1942




PROLOGUE

Returned from SECOND War Patrol on 22 March 1942 , docked at Submarine Base Pearl Harbor, T.H. Commenced shore leave
for crew. Dry dock period on 1 April-14 May, followed by training. Loaded twenty four MK 14 torpedoes and provisions 21-23 May. LCDR W.H. Brockman Jr. , USN, relived LCDR J.P. Thew, USN, of command. Ready for sea 24 May.



NARRATIVE

May 24, 1942


1600 Departed Submarine Base, Pearl Harbor, T.H. for assigned patrol area North of Midway Island.

1730 Dive

1800 Surface


May 25, 1942

0700 Dive

0730 Surface

1000 Begin gunnery, dive, and fire control drills.

1230 End drills


May 26, 1942

0730 Dive

0800 Surface


May 27, 1942

0730 Dive

0800 Surfaced


May 28, 1942

0730 Dive

0800 Surfaced


May 29, 1942

0730 Dive

0800 Surface


May 30, 1942

0730 Dive

0800 Surface


May 31, 1942




June 1, 1942

0000 Arrived in assigned area, North-West of Midway for defensive patrol operations.

0730 Dive

1900 Surface


June 2, 1942

0530 Storms arrived in area. Overcast with heavy precipitations, fog. Winds at 20 knots, direction 129.

0730 Trim Dive

1000 Surface



June 3, 1942

Storms continued.

0730 Trim Dive

0900 Surface



June 4, 1942

0230 Storms cleared.

0545 Observed PBY "STRAWBERRY 5" 29-31N 178-29W Course 000 Altitude 2000 (AIRCRAFT CONTACT NO.1) . Exchanged recognition signals.

0603 Dive

0644 Sound reported distant, heavy, fast props bearing 317 long range. Ordered course 300 to investigate.

0658 Spotted DD bearing 331 six miles. 29-36N 178-30W. Course 125, Speed 20 knts. GENERAL QUARTERS-TORPEDO

0703 Second DD spotted. Course 125 20 knots.

0708 DD closing fast. 200 ft depth ordered. Rigged for Silent Running and Depth Charge.

0712 NAUTILUS at 200 ft. DD passed above, no signs of detection.

0714 Ordered periscope depth. Sound tracking "large, noisy, fast, props" bearing 020 estimated 7500 yards.

0716 Opened outer doors tubes 1-4

0718 (TORPEDO ATTACK NO.1) Spotted Nagara Class CL bearing 030 1600 yards Course 145 Speed 24 knots. Fired Tubes 1-4

0718:20 Premature detonation observed/audible.

0718:31 Premature detonation observed/audible.

0718:35 Premature detonation observed/audible.

0718:44 Premature detonation observed/audible.

0719 Pinging. DD astern 1200 yards closing. Ordered 250 ft. Rigged for depth charge and silent running.

0720 Begin DC attack No.1 Splashes heard above.

0721 DC explosions, above.

0724 Close DC, above.

0725 Thermal layer detected at 270 feet. Leveled boat at 275 feet.

0726 Pinging. Sound reports second DD arriving from bearing 270.

0730

0930 Depth charge attack ended. Destroyers heard leaving area high speed.

0944 Lost sound contact. Secured GQ. Reload of tubes commenced.

1103 Sound contact, fast props bearing 000, long range.

1104 Course 075 4 knts. Periscope depth.

1422 DD spotted bearing 022 8 NM. GENERAL QUARTERS-TORPEDO.


1445 Spotted damaged CV (previous air attacks) bearing 011 7 NM. CV appears burning and dead in water.

1446 Began approach on damaged CV. CV somewhat down by stern but afloat.

1525 CV identified as SORYU. One DD alongside providing assistance

, second DD patrolling immediate area west, third DD patrolling to east.

1600 DD approaching in sweep west of CV. Rigged for silent running, depth charge, ordered 300 ft.

1610 At 300 feet, DD passed above, did not detect NAUTILUS. Continued on approach course 060

1615 Ordered periscope depth.

1616 Several large explosions audible in area, unknown origin. Possibly damaged CV.

1619 Periscope depth. CV SORYU nearing 355 4850 yards. Explosions visible, smoke and flames from stern flight deck.

1622 DD alongside suddenly got underway. Sound reports DD's closing, fast.

1623 Ordered 300 ft, rigged for silent running, depth charge.

1624 Pinging.

1628 DC Attack No.2 began. DC explosions, above.

1634 Pinging. DC explosions astern.

1643 Close DC above, damaged reported (See Major Defects and Damage Section)

1655 DC explosions.

1702 Pinging.

1703 DC explosions, astern, distant.

1705 DD above. Splashes.

1739 Passed below carrier. Depth 330 ft.

1742 DD above, DC explosions close.

1743 Battery power reported at 40 percent.

1909 Large explosions, breaking up noises heard. Possibly CV sinking, breaking up.

1914 Close DC. Damage reported.

1917 DD above. DC splashes.

1948 DC explosions. Damage Reported (See Damage, Defects)

1949 Flooding in Forward Torpedo Room. Damage Control Party dispatched.

1952 Forward torpedo reported multiple leaks, attended by DC party.

1953 Depth control difficulties encountered due to forward flooding. Trim Pump heavily damaged, undergoing repairs.

1956 Flooding in forward torpedo compartment reported under control. Bilges reported filled, one foot of water reported in compartment.

1957 Pumping water to compensate.

2012 Trim Pump reported semi operational. Most depth control restored.


2100 Battery power reported at 25 percent

2230 Enemy appeared to lose contact



June 5, 1942

0011 Sound check remains clear. Ordered Periscope Depth


0017 Both periscopes non operational, apparently damaged in attack.

0025 Surfaced. DD spotted laying to at 8000 yards bearing 127. Did not detect NAUTILUS.

0501 No.1 Periscope Repaired (Control Room)

0600 Dive

1300 No. 2 Periscope Repaired (Conning Tower)

1900 Surface Course 090. Maintained defensive station as ordered.


June 6, 1942

0700 Dive

1930 Surface


June 7, 1942

0700 Dive

1142 Spotted US CV Task Force (CV Enterprise, CV Hornet) 29-27N 178-31 W. Course 240 25 knots.

1930 Surface


June 8, 1942

0700 Dive

1930 Surface


June 9, 1942

0400 Ordered to proceed to Midway at best speed.



June 10, 1942

0500 Docked Midway. Refueled and provisioned, damage repaired.

June 11, 1942

Refueled and provisioned, damage repaired. throughout the day

0900 Received orders from COMSUBPAC to proceed to patrol Areas 4A , 4B off Honshu. Ready for sea 12 June.


June 12, 1942


0600 Departed Midway for assigned areas 4A, 4B. Course 275 Speed 10 knots.

June 13, 1942

En route patrol area.

0700 Dive

0730 Surface


June 14, 1942

En route patrol area.

0700 Dive

0730 Surface


June 15, 1942

En route patrol area.

0700 Dive

0730 Surface


June 16, 1942

En route patrol area.

0700 Dive

0730 Surface


June 17, 1942

En route patrol area.

0800 Dive

0830 Surface


June 18, 1942

En route patrol area.

0800 Dive

2100 Surface


June 19, 1942

Within range of aircraft from Honshu, Bonin Islands, and Marcus Islands. Four hundred nautical miles
from assigned areas.

0800 Dive

1956 Aircraft Spotted (AIRCRAFT CONTACT NO.2) bearing 337. Ordered 150 ft. NAUTILUS was not spotted.


2230 Surface


June 20, 1942

0831 Dive

2300 Surface

June 21, 1942

0900 Dive

1953 (AIRCRAFT CONTACT NO. 3) Spotted "MAVIS" bearing 216 9000 yards. Ordered 150 feet.

2100 Periscope depth.

2300 Surface


June 22, 1942

0000 Entered Area 4A

0915 Dive

2300 Surfaced


June 23, 1942

0935 Dive

2300 Surface


June 24, 1942

0920 Dive

2323 Surface


June 25, 1942

1000 Dive

1232 Spotted two armed fishing boats/pickets bearing 123.

1235 GENERAL QUARTERS-BATTLE SURFACE-GUN ACTION

1242 Surface

1249 Sunk 200 ton armed fishing boat by gunfire. Four six inch hits. Target burned, sunk.

1254 Sunk 200 tons armed fishing boat by gunfire. Three six inch hits, numerous .50 mag hits. Target exploded, sunk.

Both boats sunk at 34-13N 141-04E


June 26, 1942

0915 Dive

2305 Surface

June 27, 1942

0915 Dive

2305 Surface


June 28, 1942

0915 Dive

2305 Surface


June 29, 1942

0915 Dive

2305 Surface


June 30, 1942

0915 Dive

2305 Surface

2330 Batteries, possibly from damage sustained in earlier DC attack not holding full charge.
Fuel is lower than estimated, possible fuel leak. With minimum patrol time requirement met,
turned east for Pearl Harbor via Midway. (See Major Defects and Damage Section)


July 1, 1942

0000 Course 092 at 12 knots en route Pearl Harbor via Midway.

0920 Dive

2320 Surface


July 2, 1942

En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface



July 3, 1942

En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface


July 4, 1942

En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface

1710 (AIRCRAFT CONTACT NO. 4) "MAVIS" sighted bearing 176. Range steady. Ordered Dive to 150 ft.

No attack developed, NAUTILUS not sighted.

2300 Surface



July 5, 1942


En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface



July 6, 1942


En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface


July 7, 1942

En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface


July 8, 1942


En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface


July 9, 1942


En route Pearl Harbor via Midway. Uneventful.

0800 Dive

0830 Surface



July 10, 1942


1230 Docked Midway to fuel.

1700 Departed Miway for Pearl Harbor.



July 11, 1942


En route Pearl Harbor.

0800 Dive

0830 Surface


July 12, 1942


En route Pearl Harbor.

0800 Dive

0830 Surface



July 13, 1942


En route Pearl Harbor.

0800 Dive

0830 Surface



July 14, 1942


0800 Docked Submarine Base Pearl Harbor T.H. Terminated War Patrol.


CONTACTS


Aircraft Contacts

No.

1. 1942/06/04 0545
29-31N 178-29W
Brg. 180 Rng 5 NM Crs. 000 Alt. 2000
PBY Catalina "STRAWBERRY 5"
SD/Visual
Exchanged Rec. Signals


2. 1942/06/04 1956
32-4N 142-3E
Brg.337 Rng. 3000 yd Crs. 300 Alt. 1000
H6K MAVIS
Visual


3. 1942/06/21 1953
33-0N 142-15E
Brg. 216 Rng. 5000 yd Crs. 090 Alt.1500
H6K MAVIS
Visual


4.1942/07/04 1710
28-59N 161-0E
Brg. 176 Rng. 8000 yd Crs. 030 Alt. 2000
H6K MAVIS
Visual-SD failed to detect.



Ship Contacts


No.

1. 1942/06/04 0658
29-36N 178-30W
Brg. 331 Rng. 6 NM
Crs. 125 Spd. 20-24 kts
CV (4), BB (2) CA (2+) CL (2+) DD (8+)
Enemy CV Task Force NW Midway. Contact Report Sent.


2. 1942/06/04 0718
29-36N 178-30W
Brg. 030 Rng. 1500 yd
Crs. 145 Spd. 24 kts
CL (Nagara Class)
Torpedo Attack No.1


3. 1942/06/04 1542
30-38N 177-25W
Brg.011 Rng. 7 NM
Crs. 350 Spd. 0 kts
CV (1) DD(2)
Damaged CV SORYU, dead in water, burning.
Believed sunk at 1909.
DD's were Asashio or Kagero Class, one patrol,
one guarding, assisting survivors.


4. 1942/06/07 1142
29-27N 178-31W
Crs. 240 Spd 25 knots
Brg. 090 Rng. 9 NM
CV(2) CA, CL, DD
Task Force 16 (Enterprise, Hornet)
Exchanged Rec. Signals w. Benham DD-397


5. 1942/06/25 1232
34-13N 141-05E
Crs. 230 Spd. 7 kts
Brg. 123 Rng. 5000
Armed Fishing Boats x2
Sunk by Gunfire in Gun Action No.1


ATTACK DATA

Attack Narrative

Observed enemy CV Task Force on morning of 4 June, went to GENERAL QUARTERS-TORPEDO, sent contact report to COMSUBPAC, and commenced approach for attack. After being forced deep to avoid on rushing DD, came back to periscope depth and found NAUTILUS was on far port side of the task force with vessels spaced 2500-3000 yards apart. The flat decks and island structures of four CV were observed, as well as pagoda masts of BB but were not lined up for a shot, as the a Nagara Class CL was just 1500 yards away. Taking the hand dealt, a solid firing solution was worked up on the CL and four torpedoes were fired in what seemed a "can't miss" shot. However, all four torpedoes would prematurely exploded before reaching target, one torpedo one perfect track to impact target amidships, likely a fatal blow to a CL of that tonnage, exploded roughly 50 yards from target. NAUTILUS was then forced deep to avoid counter attack from escorting DD's, allowing the task force to open range and thus NAUTILUS lost contact.

Later on 4 June, located the CV SORYU , crippled by air attack earlier in the day and commenced approach. Unfortunately, was somehow detected during approach at 5000 yards, possibly due to unobserved aircraft covering the scene, and was forced deep, to endure a six hour counterattack, which caused heavy damage.

At 1909, obvious sounds of a large vessel breaking up, along with explosions, as well explosions heard through afternoon, were heard. Upon surfacing while the DD was in sight, the large CV, which would have been visible was nowhere to be found, as she apparently succumbed to her wounds.

No other targets were encountered during the patrol worth of torpedo. However, a gun action did occur on 25 June, in which two armed fishing boats/pickets were sunk by gunfire.


USS Nautilus SS-168
THIRD War Patrol
TORPEDO ATTACK NO.1

DATE 4 June 1942
TIME 0718
LAT 29-40N
LONG 178-30W

TYPE OF ATTACK

Submerged, Periscope (No.2), day.

Ships Sunk
None

Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (AT FIRING)

NAME NAGARA(?)
CLASS NAGARA
TYPE CL
COURSE 147
SPEED 24 knots
BEARING 020
TRUE BEARING 278
RANGE 1400
AOB 85
REMARK
Part of CV Task Force

TORPEDO ATTACK NO. 1 TORPEDO FIRE CONTROL DATA (AT FIRING)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 23451
EXPLODER MK 6
SERIAL NO. 1803
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 3 degrees
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated


TUBE NO. 2
TYPE MK 14
SERIAL NO. 2352
EXPLODER MK 6
SERIAL NO. 1805
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 3 degrees
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated


TUBE NO. 3
TYPE MK 14
SERIAL NO. 23453
EXPLODER MK 6
SERIAL NO. 1807
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 3 degrees
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated


TUBE NO. 4
TYPE MK 14
SERIAL NO. 23455
EXPLODER MK 6
SERIAL NO. 1809
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 3 degrees
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated


OWN SHIP DATA (AT FIRING)

DEPTH 64 ft
COURSE 260
SPEED 3 kts
ANGLE 1 down
SEA STATE Calm, light Chop. Wind at 1 knot, direction 179.







USS Nautilus SS-168
THIRD War Patrol
GUN ACTION NO.1

DATE 25 June 1942
TIME 1242
LAT 34-13N
LONG 141-04E


ACTION NARRATIVE

While on submerged patrol, OOD manning No.2 periscope in conning tower observed masts and sails
bearing 123, ordered closing for review of contacts. Upon reaching conning tower, Commanding Officer
reviewed contacts from 1000 yards, where machine guns/auto-cannon of unknown caliber were visible. Finding it
likely these fishing vessels also serviing as ASW picket vessels, chose to open the range and engage.

BATTLE SURFACE-GUN ACTION was called and range opened to 5000 yards with NAUTILUS positioned for
broadside attack, at which point tanks were blown for
rapid surfacing at 1242 .Commenced firing at 1244, four hits scored on Target No.1 , the
trailing target, second in the column. This target opened fire briefly but the hits and subsequent fires silenced these guns.
Burning bow to stern and adrift, crew members were observed manning a liferaft. Disengaged and increased speed to close range on
lead vessel, which was now maneuvering wildly and firing random MG/AC bursts in direction of NAUTILUS. Splashes observed off starboard bow, not close.

At 3000 yards forward six inch gun opened fire, scoring two near misses soon after, which caused the boat to take a hard port turn and
"Cross the T" of NAUTILUS at just 2500 yards. Six inch opened fire as did the forward .50 cal MG. The six inch scored two direct hits and forward MG scored many.
Fires soon broke out, but the persistent boat continued firing on NAUTILUS, without scoring hits.

NAUTLUS, no wishing to close further, made a swing to port to bring broadsides to bear. However,
another six inch hit followed by a fusillade of .50 cal MG fire from fore and aft machine guns
set off a large explosion, leaving the boat a flaming wreck, which quickly capsized with no survivors observed.

The first target wss no longer visible, just a debris field and smoke marking its location. Cease fire and decks cleared was ordered.
Turned course 180 at high speed and secured from GQ.


ROUNDS EXPENDED

6" 53 Caliber- 21

.50 Caliber MG- 215

HITS-

6' 53 Caliber- 7 HE (4 on Target 1, 3 on Target 2)

.50 Caliber MG - 100-125 AP


TARGET DATA (at firing)

TARGET No. 1

NAME N/A
CLASS Fishing Boat-Picket-Armed
TYPE Motorized/Sail
TONS 200
COURSE 260
SPEED 7 knts
BEARING 090
RANGE 5000-2500 yards
REMARK
Boat armed with machine guns/auto cannon of unknown caliber, opened fire, no hits on NAUTILUS.


TARGET No. 2

NAME N/A
CLASS Fishing Boat-Picket-Armed
TYPE Motorized/Sail
TONS 200
COURSE 010
SPEED 8 knts
BEARING 040
RANGE 3000-2500 yards
REMARK
Boat armed with machine guns/auto cannon of unknown caliber, opened fire, no hits on NAUTILUS.


Ships Sunk

Fishing Boat-Armed-Picket
200 tons
6/25/1942 1249 (local)
34-13N 141-05E


Fishing Boat-Armed-Picket
200 tons
6/25/1942 1252 (local)
34-13N 141-05E

Ships Probably Sunk
None


Ships Damaged
None


Ships Probably Damaged
None


Own Ship Data (in relation to target at firing)

COURSE 260
SPEED 17-10 knots
AOB 70-100 degrees, port.



NAVIGATIONAL AIDES

No navigational aides were sighted during this patrol.



WEATHER


Weather off Midway was calm and clear with exception of a storm front rolled into area on 3 June and cleared at 0300 4 June.

Weather en route to patrol areas 4A/4B was mostly pleasant as well as pleasant in area. Heavy seas and winds did kick up final day in patrol area.



TIDES


Tidal conditions encountered were normal for the areas.



ANTI SUBMARINE COUNTERMEASURES AND EVASION

Depth Charge Attack No.1
4 June 1942
0720-0930

Two destroyers of unknown type, possibly Asashio or Kagero closed
on NAUTILUS after Torpedo Attack No.1. Fifty four depth charges were delivered over nearly two hour attack. Enemy utilized passive and active sonar, taking turns making attacks. A thermal layer was detected at 270 feet, NAUTILUS leveled off at 275 ft, where wost depth charges exploded above NAUTILUS at est depth of 250 ft. After a close charge at 275, NAUTILUS wen to 300 ft. At 0900 one enemy destroyer was heard leaving area at high speed, while another began pinging and made two runs, then stopped to listen. At 0910, the DD was heard leaving area at high speed on estimated SSE course. Sound lost contact at 0930. While NAUTILUS suffered no damage, the task of destroyers was accomplished, permitting enemy CV force to escape.


Depth Charge Attack No.2
4 June 1942 1628-2230

This depth charge attack was prolonged, and accurate, causing damage to NAUTILUS (See MAJOR DEFECTS AND DAMAGE SECTION BELOW) and prevented NAUTILUS from finishing off the crippled CV SORYU.

Enemy destroyer, believed to be of KAGERO Class, detected NAUTILUS during approach on CV at roughly 5000 yards, utilizing active and passive sonar throughout attack. Multiple charges landed close throughout six hour ordeal. A second DD, which had been along side the CV assisting, joined in after the CV sunk (breaking up noises and explosions audible at 1909) and commenced a team tactic, with a degree of competence hope to not encounter again.

One DD was heard departing area at high speed around 2200 hours, while the other remained in area, dropped a pattern close to NAUTILUS at 320 feet, then went silent, likely listening, thus NAUTILUS lost contact at 2230 hours.

Upon surfacing, spotted DD laying to, most likely listening at 8000 yards. Choppy seas had kicked up and likely masked our noise as surfaced.


Evasion

Evasion was conducted by searching thermal layers, and hiding below them, frequent course changes as well. Speed bursts utilized when enemy vessels above to drop charges. Boat was rigged for silent running, with all non essential equipment shut down. RPM of all electric motors was kept at 80 for a speed of 2.5 knots, aside from the brief periods during speed "bursts".



MAJOR DEFECTS AND DAMAGE

All defects or damage, unless otherwise noted, were repaired at sea.


Defects

Forward Batteries lost full capacity during second part of patrol, preventing battery capacity from rising about 80 percent for duration. Unsure if this was a equipment defect or damage from 4 June depth charge attack that went undetected during brief stopover at Midway prior to departure. Issue could not be remedied at sea and was repaired upon return to Pearl Harbor.


Main Clean Oil Fuel tank had a slow leak that was not detected until in Area 4A off Honshu during second portion of the patrol, when it was noticed fuel remaining was not close to normal estimates. A low leak, possibly material defect or possibly from undetected damage was found upon return to port and repaired.


Damage

Depth Charge Attack No.1

1. Piping leaks-All compartments

2. High Pressure Air Line leaks-All compartments

3. Shattered light bulbs and glass fixtures-All compartments


Depth Charge Attack No.2

1. Flooding-Forward Torpedo room due to
busted pipes, valves, and damaged forward hatch. Bilges flooded with one
foot of water in compartment.

2. Trim Pump- Temporarily non operational but repaired.

3. Hydraulic Pumps

4. Dive Planes Transmission-Bow

5. Dive Planes Transmission-Stern

6. No.2 Electric Motor

7. No.3 Electric Motor

8. No.4 Diesel Engine

9. No.1, No.2, No.3, No.4 torpedo tubes

10. Compressor

11. Stern Batteries

12.No.1 Periscope

13.No.2 Periscope

14. Radio set

15. Radio Antenna

16. Fore 6' 53 Caliber gun

17. Aft 6' 53 Caliber gun

18. Sonar Head Hoist

19. Minor hull damage forward conning tower frame and frame
for forward torpedo compartment. Repaired at Pearl Harbor.

20. Busted piping and valves in all compartments.

21. Busted high pressure air lines all compartments.



SOUND CONDITIONS AND SOUND GEAR

Sound conditions in Midway area were optimal. This likely contributed to the effectiveness of enemy sound gear against NAUTILUS.


Sound conditions in patrol areas 4A and 4B were mediocre.



THERMAL LAYERS


1942-06-04
29-31N 178-29W
270 feet


RADAR

SD radar typical detection range was 8 NM. On 4 July (Aircraft Contact No. 4) SD failed to detect aircraft entirely, ac spotted by lookouts. SD functional, reason for not detecting unknown.


RADIO


Radio function was normal, exception loss of optimal function noticed after damage in depth charge attack for duration of patrol.



PERSONNEL

Crew performance was excellent in the face of trying circumstances ranging from four faulty torpedoes, to two intense depth charge attacks, along with a extension of patrol with a long transit.

Two crew members achieved qualification during this patrol.


HEALTH AND HABITABILITY

Overall conditions aboard were satisfactory through the patrol. Prolonged attack of 4 June left boat in a state of somewhat disarray but this was remedied quickly, even before a stopover at Midway, with repairs all damage that could be repaired underway completed by docking.

Meals were well prepared a highlight of our long days at sea.

In spite of the intense attack of 4 June, no serious injuries occurred among the crew.


MILES STEAMED-FUEL USED

Pearl to Midway Area
1500 miles 18555 gallons


In Midway Area
5500 miles 55566 gallons


Midway to Areas 4A 4B

2586 miles 30255 gallons

In Areas 4A 4B

5200 miles 49898 gallons

Area 4A 4B to Midway

2600 miles 31233 gallons


Midway to Pearl

1350 miles 23245 gallons



DURATION

Days

Pearl to Midway Area 7

Midway Area 10


Midway 1.5


Midway to Areas 10


In Areas 11


Areas to Midway 11


Midway to Pearl 3



FACTORS IN DURATION


Torpedoes 20

Fuel 42555 gallons

Provisions 33 days

Crew Indefinite


Reason for termination of patrol: Limited fuel battery capacity. Operational
order listed 1 July as date may return to port as well.



REMARKS

A challenging patrol conducted during a massive, intense, and decisive sea naval battle in addition to cruise to home waters of the Japanese Empire.

Four prematurely detonating torpedoes cost NAUTILUS the sinking of a light cruiser on 4 June.

While the Commanding Officer regrets not firing on the damaged carrier encountered later on 4 June from long range, the approach for a closer shot was to ensure positive identification of the damaged CV in addition to doubts about torpedo performance at such range.


W.H. Brockman Jr. , LCDR, USN.

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Old 02-02-22, 09:59 PM   #5213
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Default USS Nautilus Third War Patrol Screenshots

June 4 1942



Afternoon of June 4th, discovered the Soryu dead in the water, fire burning (smoke plume visible) damaged by air attacks from SBD's earlier in the day.


Afternoon of June 4th, discovered the Soryu dead in the water, fire burning (smoke plume visible) damaged by air attacks from SBD's earlier in the day.Second screen shot.

Attempted approach by one of two DD's standing by somehow detected NAUTILUS during approach (believe a unobserved aircraft may have spotted) at 5500 yards and prevented attack. The six hour depth charge attack damaged the NAUTILUS and prevented a attack



At 1909, the SORYU slid beneath the waters. Note: The was due to the fire causes damage mod by TheDrarkWraith. The ship burned all afternoon, a few explosions where heard while I was submerged. Seems fire finally caused the loss, pretty cool. Disappointed did not get to finish the carrier off with torpedoes though.



Smoke after SORYU sunk. Many survivor rafts in water.



Smoke/flames after SORYU sunk. Many survivor rafts in water.





Smoke/flames after SORYU sunk. Many survivor rafts in water.

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Old 02-04-22, 01:14 PM   #5214
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Default USS Nautilus SS-168 Fourth War Patrol

TMO 2.5 Update BH V 2.0
Donation Narwhal
100 difficult, cams, contacts on for testing new mission added to campaign.



War Patrol Report
USS Nautilus SS-168
FOURTH War Patrol
8 August-27 August 1942


PROLOGUE

Returned from FOURTH War Patrol on 14 July, 1942, docked at Submarine Base Pearl Harbor. Voyage and damage repairs began immediately
as NAUTILUS was prepared for a special assignment on upcoming patrol. Provisions and eight MK 14 torpedoes loaded 5-6 August. On 7 August,
ninety men of "B" Company, Second Marine Raider Battalion, along with their equipment were brought aboard. Ready for sea 8 August.



NARRATIVE

NAUTILUS, along with ARGONAUT formed Task Group 7.15 (TG 7.15) to conduct a special mission for this patrol. NAUTILUS and ARGONAUT together,
was assigned to transport, land, support, and extract the 121 men of the Marine Second Raider
Battalion on Butaritari Island, Makin Atoll, Gilbert Islands. NAUTILUS transported "B" Company of the Second Raiders, a total of 90 men,
along with their weapons and equipment.

In addition to successful completion of the special mission, four torpedo, and one gun attack-shore bombardment were conducted.
Three enemy vessels were sunk, two by torpedo, one by gunfire. Four valuable, large, and full fuel-oil storage tanks were destroyed by
gunfire.




8 August

0700 Departed Submarine Base Pearl Harbor, T.H. for Special Mission.

1001 Trim Dive

1020 Surface


9-14 August

En route Makin Atoll, Gilbert Islands on course 235 11.5 knots. Daily routine of dives, maintenance,
and drills conducted, with exception of 14 August, when the Marines were permitted on deck to conduct
exercises in the morning and after dark.

15 August

1930 Marines on deck, conducted launch exercise.

16 August

0600 15 NM SE of Butaritari Island, Maki Atoll, Gilbert Islands.

0643 Submerged just before dawn to conduct reconnoiter of Butaritari Island.

1500 Observed enemy facilities ashore, including large fuel storage tanks. Two small PC
type vessels in lagoon. Numerous installations. No heavy shore defenses observed.

2000 Preparations for landing operations began.

2036 Surface


17 August

0320 Flooded to decks awash for boat deployment.

0326 B Company departed in boats. 3-1N 172-55E 6 NM South of Butaritari Islands

0400 Received orders to conduct bombardment of Ukiangong Point
at 0700 hours in support of Raiders.


0623 Submerged 5 NM off Ukiangong Point for approach before dawn.

0645 GENERAL QUARTERS-BATTLE SURFACE-GUN ACTION for shore bombardment.

0657 Surface

0700 Commenced firing

0705 Destroyed Large Fuel tank on Butaritari Island

0709 Destroyed Large Fuel tank on Butaritari Island

0715 Destroyed Large Fuel tank on Butaritari Island

0725 Damaged Bunker/Observation post Ukiangong Point, Butaritari Island

0730 Destroyed Large Fuel tank on Butaritari Island

0740 Sunk Tug Boat (1000 tons) in Lagoon by gunfire 3-04N 172-47E.

0743 Fired on small boat underway in lagoon, out of range.

0745 Ceased fire. Multiple fires of fuel tanks and sunken tug burning strong,
visible for miles.

0746 Submerged

0750 Secured General Quarters

1137 Aircraft spotted bearing 264 9000 yards (Aircraft Contact No.1) MAVIS.
Ordered 150 ft.

1227 Periscope depth. Spotted MAVIS (Aircraft Contact No.2) Dropped bombs
depth charges in water, about 500 yards off bow. Ordered 150 ft.

1303 Periscope depth. All clear.

1330 Aircraft (Aircraft Contact No.3) arrived on scene. MAVIS/EMILY

1334 Bombed by MAVIS flying boat, close astern. Minor damage (See Damage Section)

1335 More explosions, above, not close.

1430 Periscope depth. Heavy enemy air activity in area.
Large four engine flying boat landed in lagoon. (Aircraft Contact No.4).
Ordered 100 ft.

1548 Periscope depth. Aircraft bearing 158 (Aircraft Contact No.5)
Ordered 90 ft

2040 Surface.

2330 Unable to locate boats at rendezvous.


18 August


0030 Received message from ARGONAUT, stating recovered seven boats.

0045 Received message from LT COL Carlson stating seventy two men ashore unable to break through
rough tides, will make further attempts in the morning.

0635 Submerged six miles South of Ukiangong Point.


0851 (Aircraft Contact No.6) Spotted EMILY flying boat 185 8000 yards.

0930 Spotted boats.

0937 Surfaced

0945 Submerged, emergency. Multiple aircraft closing on SD radar
(Aircraft Contact No. 7) at 8 and 6 miles.

1000 Unable to conduct extraction due to heavy enemy air presence.

1044 Received radio message, will go for
extraction after sundown.

1257 ( Aircraft Contact No. 8) bearing 110. (3 Zeros)


1522 Sound reported faint props to sea, bearing 273.

1543 Course 278 to investigate sound contact. Props noises indicated ship closing.

1559 Smoke sighted bearing 358.

1606 Masts and smoke spotted, inbound ship. GENERAL QUARTERS-TORPEDO.

1618 Large AK with MS type escort. Course 095 10 knots.

1636 Target Course 060 Speed 9 knots. Position forcing stern shot.

1638 Target Identified as AK DAITOKU MARU 7590 tons.

1640 Tubes No. 5 and No.6 made ready.

1641 Target zigged towards NAUTILUS.

1642 Pinging

1643 (Torpedo Attack No.1) Fired tubes 5,6, at freighter "Down the throat"

1643:15 Premature detonation

1644 Escort closing. Ordered 200 ft, rigged for depth charge, rigged for silent running.

1646 Splashes. Escort above.

1646:31 DC explosions

1647 Several Close DC explosions. Damage reported (See Defects and Damage Section)

1652 Three close DC explosions, above.

1657 DC explosions. Damage reported. See Defects and Damage Section.

1701 Close DC explosion astern.

1705 Escort above. Splashes.

1830 Enemy appears to have lost contact with NAUTILUS at 375 ft depth.

1831 Tracking AK

1900 Lost contact with AK

1935 Lost contact with Escort, possibly "sleeping"


1940 Batteries reported at fifty percent power.

2048 Secured General Quarters

2321 Periscope Depth.

2330 Surface.

2335 Message from LTCOL Carlson via ARGONAUT. Extraction at entrance to lagoon
2345.


19 August

0000 Searched designated extraction area off lagoon entrance.

0037 Spotted enemy MS type escort bearing 337 6000 yards estimated.

0122 GENERAL QUARTERS-TORPEDO.

0130 Torpedo Attack No.2 Fired Tubes 1-4

0131 Two premature detonations

0135 Torpedoes missed

0136 Evading escort on surface, searching for NAUTILUS

0230 Sighted boat, escort 2000 yards off, does not appear spotted boat
or NAUTILUS. Escort appears to be laying to, listening.

0245 Torpedo Attack No.3 Fired tubes 1-3.

0247 Torpedo impact! Large explosion.

0316 Shimushu Class Minesweeper-Escort Vessel 860 tons sunk.
3-04N 172-41E

0325 Recovered boat 1

0605 Recovered boat 2

0610 Recovered Boat 3.

0615 All boats recovered for seventy two men total.

0620 Received message from ARGONAUT, all men recovered, mission accomplished.
Departing area.

0621 Set course 315 flank speed to depart area en route Pearl Harbor.

0700 Overcast, light fog, wind, choppy seas.

0820 DD AK spotted bearing 355 9000 yards

0821 GENERAL QUARTERS-TORPEDO

0852 Tubes 1-4 readied.

0854 (Torpedo Attack No.4) Fired tubes 1-4.

0855:20 Torpedo wake observed running below target. Detonated about 15 yards on opposite side of target

0855:25 Torpedo impact!

0855:30 Torpedo impact!

0855:36 Torpedo impact, failed to detonate-DUD.

0856 Rear DD spotted closing at high speed 3000 yards.
Order 300 ft, rigged for depth charge and silent running.

0901 Multiple large explosions, sounds of ship breaking up.

0902 Pinging. DD above. Splashes

0903 DD explosions astern.

0904 Pinging, second (lead) DD believed on scene.

0905 More breaking up noises.
JOKUJA MARU 7390 tons sunk
3-34N 172-34E

0908 DD above. Many splashes.

0909 Many DC explosions, none close. Above, astern.

0915 DD above. Splashes.

0949 Series of close DC explosions.

0950 Damage reported (See damage section Flooding in engine rooms.

0951 Damage Control party assigned.

0956 DC party reports leaks stopped in engine room. Bilges filled
with four inches of water in compartment. Flooding under
control, pumping water to restore proper control.

1000 DC part reports No.3 electric motor disabled. Stern batteries
damaged.

1018 Sound reports one DD leaving area at high speed, other is about 3000
yards, hunting.
Distant pings audible through out. NAUTILUS at 322 ft depth,
pumping water.

1100 Lost contact with DD.


1130 Secured General Quarters.


2000 Periscope depth


2018 Surface


20 August

0753 Dive! (Aircraft Contact No. 8) SD contact 6 NM closing, fast.

1900 Surface


21-26 August

En route Pearl Harbor


27 August

1105 Docked Submarine Base Pearl Harbor. Terminated War Patrol


CONTACTS


Aircraft Contacts

No.

1.1942/08/17 1137 (local)
H6K MAVIS 3-2N 172-52E
Crs. 270 Alt 1000

2.1942/08/17 1237 (local)
H6K MAVIS/H8K EMILY
3-2N 172-52E


3.1942/08/17 1337 (local)
H6K MAVIS 3-2N 172-52E
Landed in Makin lagoon.

4.1942/08/17 1548 (local)
H6K MAVIS 3-2N 172-46E


5.1942/08/18 0851 (local)
H6K MAVIS 3-1N 172-54E
Crs. 200 Alt 500

6.1942/08/18 0851 (local)
SD only 3-2N 172-54E
Rng. 7 NM Closing


7.1942/08/18 0851 (local)
Two SD contacts 8 and 6 NM
3-1N 172-54E



8.1942/08/18 1257 (local)
3 Zeros 3-6N 172-38E
Crs 100 Alt 4000 Spd 200 knots


9.1942/08/20 0753 (local)
SD Contact 6 NM closing.
7-0N 178-0E


Ship Contacts


No.

1. 1942/08/18 1606(local)
2-59N 172-34E
AK, MS
Crs. 060 Spd. 9 knots
Torpedo Attack No.1


2.1942/08/18 0037 (local)
3-04N 172-41E
MS/Escort
Torpedo Attack No. 2 and No.3


3. 1942/08/19 0820 (local)
3-24N 172-33E
DD(2), AK (4)
Crs. 172
Spd 13 knots
Torpedo Attack No.4


ATTACK DATA

ACTION NARRATIVE

Four torpedo attacks resulting in a 7390 ton AK and 860 ton MS-Escort sunk.
Repeated torpedo failures again cost NAUTILUS a large, important merchantman and led to depth charge attack.


TORPEDO ATTACK NO.1

DATE 1942/08/19
TIME 1643
LAT 3-0N
LONG 172-34E

TYPE OF ATTACK



Ships Sunk
None

Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (at firing)

NAME DAITOKU MARU
CLASS KOBYASHI MARU
TYPE AK
COURSE 055
SPEED 6 KTS
BEARING 180
TRUE BEARING 220
RANGE 1100
AOB 0
REMARK
"Down the Throat ****" to try and hit
target after zig just before firing point.


TORPEDO ATTACK NO. 1 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO. 5
TYPE MK 14
SERIAL NO. 24150
EXPLODER MK 6
SERIAL NO. 1809
GYRO 0
COURSE 258
TRACK 0
METHOD Single bearing
POA MOT
SPREAD 0 degrees
FIRING INTERVAL 5 SECS
DEPTH 3.5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated


TUBE NO. 6
TYPE MK 14
SERIAL NO. 24153
EXPLODER MK 6
SERIAL NO. 1812
GYRO 0
COURSE 258
TRACK 0
METHOD Single bearing
POA MOT
SPREAD 0 degrees
FIRING INTERVAL 5 SECS
DEPTH 3.5feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [] No [X]
REMARK
Torpedo fired on perfect track for "down the throat"
shot after target zigged towards NAUTILUS at firing point. Sound
heard torpedo merged with target. Believe torpedo ran deeper than set, but
did not observed as was descending to avoid on rushing escort vessel.



OWN SHIP DATA (AT FIRING)

DEPTH 64 ft
COURSE 020
SPEED 3 knots
ANGLE 1.5 degrees down
SEA STATE Calm, light chop.
--------------------------------------------------------------------------------

TORPEDO ATTACK NO.2

DATE 1942/08/19
TIME 0130
LAT 3-04N
LONG 172-41E

TYPE OF ATTACK
Surface-Night


Ships Sunk
None

Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (AT FIRING)

NAME NA
CLASS Shimushu
TYPE Minsweeeper-Escort Vessel
COURSE 180
SPEED 6 knots
BEARING 0
TRUE BEARING 091
RANGE 3500 yards
AOB 90 P
REMARK




TORPEDO ATTACK NO. 2 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 24151
EXPLODER MK 6
SERIAL NO. 1809
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated



TUBE NO. 2
TYPE MK 14
SERIAL NO. 24170
EXPLODER MK 6
SERIAL NO. 1815
GYRO 0
COURSE 050
TRACK 100 P
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [ ] No [X]
REMARK
Miss, unknown reason.


TUBE NO. 3
TYPE MK 14
SERIAL NO. 24151
EXPLODER MK 6
SERIAL NO. 1809
GYRO 0
COURSE 258
TRACK 107
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely Detonated



TUBE NO. 4
TYPE MK 14
SERIAL NO. 24179
EXPLODER MK 6
SERIAL NO. 1821
GYRO 0
COURSE 050
TRACK 100 P
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [ ] No [X]
REMARK
Miss, unknown reason.




OWN SHIP DATA (AT FIRING)

DEPTH Surfaced
COURSE 065
SPEED 2 knots
ANGLE 0 down
SEA STATE Choppy



-----------------------------------------------------------------------------------------------------


TORPEDO ATTACK NO.3

DATE 1942/08/19
TIME 0245
LAT 3-04N
LONG 172-41E

TYPE OF ATTACK
Surface-Night


Ships Sunk
Shimushu Class Minesweeper-Escort Vessel
860 tons 3-04N 172-41E
0316 (local)

Verification:

Observed torpedo hit, followed by massive explosion and numerous
secondary explosions. Visually observed vessel sink at 0316 hours.

Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (AT FIRING)

NAME N/A
CLASS Shimushu
TYPE Minesweeper-Escort Vessel
COURSE 125
SPEED 0
BEARING 0
TRUE BEARING 359
RANGE 3200 yards
AOB 88 S
REMARK
Vessel was stationary, likely listening, believing NAUTILUS had submerged.


TORPEDO ATTACK NO. 3 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 24167
EXPLODER MK 6
SERIAL NO. 1411
GYRO 0
COURSE 000
TRACK 89 S
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 3.5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [] No [X]
REMARK
Missed, cause unknown.


TUBE NO. 2
TYPE MK 14
SERIAL NO. 2419
EXPLODER MK 6
SERIAL NO. 1416
GYRO 0
COURSE 000
TRACK 89 S
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 3.5 feet
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit, target sunk.


TUBE NO. 3
TYPE MK 14
SERIAL NO. 24196
EXPLODER MK 6
SERIAL NO. 1417
GYRO 0
COURSE 000
TRACK 89 S
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 SECS
DEPTH 3.5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No []
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [] No [X]
REMARK
Missed, cause unknown.



OWN SHIP DATA (AT FIRING)

DEPTH Surfaced
COURSE 030
SPEED 2 knots
ANGLE 0 down
SEA STATE choppy


----------------------------------------------------------------

TORPEDO ATTACK NO.4

DATE 1942/08/19
TIME 0854
LAT 3-25N
LONG 172-34E

TYPE OF ATTACK
Submerged-Periscope-Day


Ships Sunk

AK JOKUJA MARU 7390 tons
3-24N 172-34E
0905 (local)

Verification:

Observed two torpedoes hit target, explosions and fire. Explosions and
sounds of ship breaking up, sinking audible through hull and on sound gear.


Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (AT FIRING)

NAME JOKUJA MARU
CLASS AK
TYPE N/A
COURSE 205
SPEED 9 KTS
BEARING 348
TRUE BEARING 111
RANGE 1414 yards
AOB 86 S
REMARK
Trucks lashed to deck. Large shipping crates visible. 3 or 4 inch guns fore and aft.


TORPEDO ATTACK NO. 4 TORPEDO FIRE CONTROL DATA (AT FIRING)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 24180
EXPLODER MK 6
SERIAL NO. 1500
GYRO 0
COURSE 122
TRACK 97 S
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs.
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Ran deeper than set. Detonated on other side of target, about fifty yards


TUBE NO. 2
TYPE MK 14
SERIAL NO. 24181
EXPLODER MK 6
SERIAL NO. 1501
GYRO 0
COURSE 122
TRACK 97 S
METHOD Single bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs.
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit under stack, large explosion.


TUBE NO. 3
TYPE MK 14
SERIAL NO. 24182
EXPLODER MK 6
SERIAL NO. 1502
GYRO 0
COURSE 122
TRACK 97 S
METHOD Single bearing
POA MOT
SPREAD 1.5 degrees-starboard
FIRING INTERVAL 5 secs.
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit just forward of amidships, behind forward mast.


TUBE NO. 4
TYPE MK 14
SERIAL NO. 24183
EXPLODER MK 6
SERIAL NO. 1503
GYRO 0
COURSE 122
TRACK 97 S
METHOD Single bearing
POA MOT
SPREAD 1.5 degrees-port
FIRING INTERVAL 5 secs.
DEPTH 5 feet
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [X] No []
REMARK
Dud. Observed impact under aft mast, torpedo failed to detonate.



OWN SHIP DATA (AT FIRING)

DEPTH 64 ft
COURSE 122
SPEED 3 knots
ANGLE 2 down
SEA STATE
Choppy





--------------------------------------------------------------------------------------------------------
USS Nautilus SS-168
FOURTH War Patrol
GUN ACTION NO.1

DATE 1942/08/17
TIME 0700-0745
LAT 3-02N
LONG 172-48E
5000-8000 yards South of Butaritari Island, Makin Atoll


ACTION NARRATIVE

In support of the Marine Second Raider Battallion, which landed on Butaritari Island around 0500,
NATUILUS was ordered to conduct a bombardment of the Ukiangong Point area as a distraction at 0700.
Having reconnoitered the island and reasonably sure that not heavy anti ship type batteries were present,
NAUTILUS surfaced 8000 yards off Ukiangong Point and commencing firing at 0700. Most visible facilities were
large fuel storage tanks. A total of four were targeted and all destroyed by six inch gun fire. Tanks were full
as large explosions result with fires that burned, some for forty eight hours. A 1000 ton PC type tug boat moored in the lagoon
was sunk by six inch gunfire as well. After a forty five minute bombardment, cease fire was ordered.
The area in which bombardment was conducted from was repeatedly patrolled by aircraft throughout the day.



ROUNDS EXPENDED

6" 53 Caliber- 101

.50 Caliber MG- 0

HITS-

6' 53 Caliber- 61

.50 Caliber MG - 0


TARGET DATA (at firing)

Target No.1

Large Fuel-Oil Storage Tank
Destroyed by gunfire


TARGET No. 2

Large Fuel-Oil Storage Tank
Destroyed by gunfire


TARGET No. 3

Large Fuel-Oil Storage Tank
Destroyed by gunfire

TARGET No. 4

Large Fuel-Oil Storage Tank
Destroyed by gunfire


TARGET No. 5

NAME NA
CLASS Tugboat
TYPE Tug/PC
TONS 1000
COURSE NA
SPEED 0
BEARING 045
RANGE 5500 yards
REMARK
Moored in lagoon. 3 inch guns observed fore and aft. Did not fire on NAUTILUS.


Ships Probably Sunk
None


Ships Damaged
None


Ships Probably Damaged
None


Own Ship Data (in relation to target at firing)

COURSE 055
SPEED 5-15 knots
AOB 120-60 P



SPECIAL MISSION

In according with operational orders, NAUTILUS transported the 90 men of "B" Company, Second Raider Battalion
to the Makin Island area and successfully deployed the men of "B" Company via their LCRL boats at 0326 hours 17 August.

The surf kicked up with strong tides just after the boats were deployed and around 0500 received reports
of difficulties from the CO, LTCOL Carlson via radio.

Per orders received, conducted a bombardment of Ukiangong Point, beginning precisely at 0700 17 August and ended at 0745. Four large fuel tanks were
destroyed in addition to other facilities, as well as 1000 ton tugboat/CP type sunk in the lagoon.

Enemy response came in form of heavy air cover. NAUTILUS suffered minor damage from bombs dropped by one of this planes.

Difficulties with boats and heavy surface prevented pick up of 72 of the Marines as scheduled on evening of 17 August. Heavy air cover
prevented full extraction during daylight hours of 18 August. A prolonged depth charge attack followed by unexpected engagement with escort vessel
preventing the pick up of nearby LCRL boats, led to final man not being extracted from his boat until 0600 on 19 August.


Special Mission completed as ordered.



NAVIGATIONAL AIDES

Butartari Island and Ukiangong Point served as excellent navigational aides when in the Makin Atoll
area. Otherwise, no aides were encountered.


TIDAL INFORMATION

Tidal activity was normal for the area, but proved a obstacle at times when deploying and recovering
the LCRL boats utilized by the Raiders.



ANTI-SUBMARINE COUNTERMEAURES AND EVASION

ASW tactics encountered by enemy escorts and destroyers were about the norm for the Japanese.
Depth charges, while causing damage, often seem to be set too shallow.

Aircraft dispatched to hunt for submarines after the morning bombard on 17 August proved a difficult
foe to counter.

Evasion tactics were standard. Consistent course, speed, and depth, changes, combined with utilization of thermal
layers and silent running. Motors were kept below 100 RPM.


MAJOR DAMAGE AND DEFECTS

Defects

None


Damage

Moderate damage was caused in the depth charge attacks. All damage was repaired at sea, unless otherwise
noted

1. No.3 Electric Motor-Disabled, knocked off mounting. Unable to repair at sea.

2. Busted sea valves and piping in engine rooms, led to flooding of bilges and nine inches of water
in compartment.

3. Stern Batteries

4. Hydraulic Pumps

5. Trim Pump

6. Stern Dive Planes Transmission

7. Bow Dive Planes Transmission

8. Piping leaks-All compartments

9. High Pressure Air line leaks-All compartments

10. Electrical grounds in Engine room, conning tower, control room.

11. Light bulbs and glass fixtures in all compartments.

12. No.5 and No.6 torpedo tubes


SOUND CONDITIONS AND SOUND GEAR

Sound Conditions were decent in most of the area.

Sound gear performance was optimal.



THERMAL LAYERS

1942/08/18
2-59 N 172-34E
220 feet



MINES

No mines were encountered on this patrol.



RADAR

SD Radar function was excellent on this patrol. Typical detection range was 8-9 NM.


RADIO

Radio function, key to success on this mission, did not disappoint, as performance was
excellent.


PERSONNEL

Crew performance was excellent on this special mission. Accommodations to make room for
90 Marine Raiders caused for conditions more cramped than usual, but the crew made do
and were excellent hosts/

Three men advanced in rating on this patrol and three others achieved qualification.


HEALTH AND HABITABILITY

Health of the crew is excellent. The boat was more crowded than usual, but a level of comfort was maintained
with morale remaining satisfactory. The success of sinking ships, bombarding enemy territory, as well as
successful completion of special assignment certainly helped in the morale department.



MILES STEAMED-FUEL USED

Pearl to Makin
2227 miles
40550 gallons

In Area
1000 miles
15455 gallons


Makin to Pearl
2250 miles
51255 gallons



DURATION

Pearl to Makin
8

In Area
3

Makin to Pearl
8


FACTORS IN ENDURANCE

TORPEDOES 2
FUEL 51255 gallons
Provisions 25 days
Crew Indefinite

Reason for termination of patrol: Per operation orders, return to Pearl Harbor upon completion
of special assignment, unless otherwise ordered.


REMARKS

A busy, challenging, special patrol. Submarines, especially those of the design of NAUTILUS prove excellent
vessels for operations such as the one conducted on this patrol. Performance of the crew as well as the
men of the Second Raider Battallion was excellent.

With great pride, the first sinking by NAUTILUS under my command occurred on this patrol, albeit it after repeated
torpedo failures. Naturally, a full load of torpedoes was not carried on this patrol due to the space requirements
for passengers and equipment, which means each torpedo had to counter, more than normal. The number one problem
with torpedoes appears to be depth control issues, followed by the prematurely detonations. While a large
merchantman and minesweeper escort were sunk by torpedo, a large, important merchantman escaped due to
faulty torpedoes.

W.H. Brockman Jr.,
LCDR, USN.

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Default USS Nautilus SS168 Fourth Patrol Screenshots (Makin Island Raid)

Variety of screenshots from Fourth patrol, which was a special operation deploying and extracting Marine Raiders at Makin Island in August 1942.





Bombarding Butaritari Island morning of August 17. Destroyed fuel storage tanks and a tug boat moored in lagoon. Ranges 4500-8000 yards.





Bombarding Butaritari Island morning of August 17. Destroyed fuel storage tanks and a tug boat moored in lagoon. Ranges 4500-8000 yards.





Simultaneous firing of 6 inch 53 caliber deck guns (AI crew) Broadside packs quite the power.



Big depth charge splash. One of my favorite mods.



Bombed/Depth charges by aircraft that snuck up on me while at periscope depth off Makin. Caused in aft torpedo room.



Close DC astern, luckily dropped a good 15-20 feet before exploding. I was at 275 ft.



DC explosion






Burning fuel tank



Sunk on 19 August 1942 North of Makin Atoll when Nautilus encountered a southbound convoy of four AK and two DD.
Two torpedoes malfunctioned (Torpedo 1 ran deep and them exploded on other side at about 50 yards. Torpedo 2 was a dud.
Two other torpedoes worked , causing serious damage. Ship sunk in about ten minutes.



Orders to bombard Makin at 0700 received via radio



Deployment of Raiders completed. (deployed further from shore than the stars are placed, will move them back in final release)



Mavis hunting for Nautilus following bombardment.



Direct hit on fuel tank gave a mushroom cloud. With EAX sound sim mod, explosion was loud and "rolled" like thunder



Nautilus at Pearl Harbor Submarine Base, preparing to depart for fourth patrol.



Nautilus trim dive.




Nautilus trim dive.








Surfacing



Below the waves





A PETE arrived on scene to assist in the hunt for Nautilus following the attempt to sink DAITOKU MARU as it approached Makin on afternoon of August 18. Only a last minute zig towards Nautilus and faulty torpedoes saved her. Escorting minesweeper gave a solid depth charging.











Fired two torpedoes "down the throat" when ideal set up was ruined by a last minute zig at firing point. One torpedo prematurely exploded just a few yards from target. This torpedo ran deeper than set, otherwise would've been a hit.Escort kept Nautilus pinned down while vessel escaped, arriving at Makin Lagoon around dusk on August 18.



Tug sunk by gunfire in lagoon at Makin Island August 17



two depth charges



Close depth charge

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Default USS Nautilus SS168 FIFTH War Patrol 15 September-9 November 1942

TMO 2.5 Update BH V2.0 (not yet released)
100 difficulty
Cams off, contacts on.


War Patrol Report
USS Nautilus SS-168
Fifth War Patrol
15 September- 9 November 1942


PROLOGUE


Returned to Submarine Base Pearl Harbor, T.H. on 27 August 1942. After disembarking
men of the Second Raider Battalion, normal leave and refit began. On 5 September, a SJ Surface Search
Radar was installed. RM1c N.B. Cox, USN, RM2c D.H. Rosencrans, RM2c W.E. Cox attended appropriate, albeit
brief training school on operation and maintenance of this new system. RdM2c B.L. Schmidt, a experienced
and rated radar operator was assigned from the Fleet Radar Training School for this patrol,
to assist NAUTILUS's crew. Underway training and testing was conducted on 11 and 12 September, with arming and
provisioning taking place 13-14 September. Twenty MK 14 torpedoes were loaded on 14 September. Ready for sea 15 September.


NARRATIVE

For her FIFTH War Patrol, NAUTILUS was assigned to a patrol area covering the Southern Kuril Islands and Eastern Hokkaido
from 45N-149E to 43-N 145-0E by 300 NM. No traffic was encountered in open ocean within the boundaries of assigned area.



September 15, 1942

Departed Submarine Base Pearl Harbor, T.H. at 0915 for assigned patrol area in Southern Kuril Islands and
South-Eastern Hokkaido. Exited harbor at 0950 and set course 255 for Midway, en route patrol area.
(Aircraft Contact No.1) At 1054 sighted PBY bearing 353 8700 yards.
SD was not active at this time. Exchanged recognition signals successfully.
Conducted trim dive at 1300 and surfaced at 1330 on previous course until 1830, when came to course 285 at
14 knots en route Midway Island.



September 16, 1942

En route Midway. Conducted underway routine. Uneventful.


September 17, 1942

En route Midway. Conducted underway routine. Uneventful.


September 18, 1942


En route Midway. Conducted underway routine. Uneventful.


September 19, 1942

Docked Midway from 1100-1700. Topped off fuel tanks and provisions. Departed at 1700 for assigned patrol area off Eastern Hokkaido and Southern Kuril Islands.


September 20, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 21, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 22, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 23, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 24, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 24, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 25, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 26, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 27, 1942

En route patrol area. Conducted underway routine. Uneventful.


September 28, 1942

En route patrol area. Conducted underway routine. Uneventful.

September 29, 1942

Now within range of enemy aircraft, submerged at dawn-0930. En route patrol area.Surfaced at 2036.


September 30, 1942

Now within range of enemy aircraft, submerged at 1009. En route patrol area.Surfaced at 2108.


October 1, 1942

Submerged at 0900. Surfaced at 2200 into heavy seas, overcast, and precipitation. Winds at 25 knots,
direction 171.


October 2, 1942

Storms persisted. DR position indicates are in assigned area.At 1936 SJ contact was made bearing 308 18,228 yards.
Estimated position 44-5N 137-31E. Heavy storms prevented immediate attack, began track via radar, awaiting
storm to subside. Estimated course of contact is 040 8-10 knots. A second, and third SJ contact was made at 1941.
By 2122, NAUTILUS was 6 NM ahead of the convoy, waiting for storms to subside for attack.

Briefly lost SJ contact from 2200, regained contact at 2221. Convoy changed course to 330 degrees.
Shadowed, awaiting storms to clear for attack.



October 3, 1942

Continued tracking targets after midnight on via SJ, no visual contact due to weather.
At 0352 SJ detected multiple stationary objects ahead, believe land. At 0410 through the fog and rain,
spotted coastal lighting. Avoiding risk of running aground, reversed course. DR position indicated possibly
located Hittokappu Bay, likely destination of the convoy. Lost SJ contacts at 0522, likely as entered the bay.

With daylight approaching and storms raging, increased speed to open range.


SJ radar made a new contact at 1158 bearing 231 20,253 yards.
Ordered intercept course 330. Storms still raging, heavy seas made forward progress difficult.
At 1309, heavy fog suddenly dissipated, revealing a large AK 7000 yards astern. Ordered a dive at 1310 for attack.

GENERAL QUARTERS-TORPEDO was called at 1313 at NAUTILUS reached 75 ft. A turn to starboard at full speed was
made to conduct a "u turn" and bring bow tubes to bear. At 1320, the turn was completed, ordered periscope
depth. Upon observation, found skies had cleared, precipitations ceased, and seas calmed to light chop.
Observed a mid sized AK on course 065, plotted at 10 knots. Tubes 1,2,3,4 were ordered readied at 1325.


(Torpedo Attack No.1) At 1333 fired tubes 1,2,3, at target. All three torpedoes hit
as aimed. About one minute after final torpedo impact, a series of explosions ripped the vessel apart.
Observed the vessel split into a "V" at the keel amidships, two sections sinking separately.
No survivors observed. Ordered 150 ft, course 180 4 knts, and secured from GQ.
At 150 ft, torpedoes ordered reloaded.

AK ANZAN MARU 3936 tons sunk
44-51N 148-34E
3 October 1942 1339 (local)

Upon torpedo reload being completed, returned to periscope depth to observe a oddly
clear and beautiful blue sky, light clouds, calm seas, as opposed to first forty eight hours in the area.
Daytime temperature was 24 degrees F. Course 220 was set for the South-Western portion of area off
Eastern Hokkaido. Surfaced at 2230 into a cold, clear sky, and calm seas.



October 4, 1942

Submerged at 1030 for patrol en route to coast of Eastern Hokkaido. Uneventful, surfaced at 2231.


October 5, 1942

Submerged 9,500 yards South-East of Cape Shirepa, Hokkaido, 10,000 yards South-West of
Daikokujima Island, Hokkaido at before dawn , for patrol off Akkeshi Bay.
Surfaced at 2230.


October 6, 1942

Submerged at 1035 for patrol in the approaches to Akkeshi Bay.Surfaced at 2218.


October 7, 1942

Submerged for patrol at dawn.At 1543, OOD on No.2 periscope spotted a four engine patrol
aircraft (Aircraft Contact No.2) bearing 248 estimated range 9000 yards. Ordered 150 ft out of
precaution. Does not appear NAUTILUS was spotted.

Surfaced at 2134 into foul weather. Heavy seas, winds, precipitations, and fog.


October 8, 1942

Storms persisted through the day, cruised on surface 80-100 NM South of Akkeshi Bay.



October 9, 1942

Storms persisted through the day, cruised on surface 80-100 NM South of Akkeshi Bay.


October 10, 1942

Storms persisted through the day. Uneventful otherwise.



October 11, 1942


Storms cleared at 1230. Maintained surfaced patrol with SJ as seas remained heavy.


October 12, 1942

Maintained surfaced patrol in low visibility, rain. Skies somewhat cleared at 1500.At 1550,
spotted fishing boat bearing 006 range six miles. Submerged at 1553 to investigate
contact at closer range. GENERAL QUARTERS-BATTLE SURFACE-GUN ACTION called at 1700.
Surfaced at 1716, blew tanks for fast surface. Commenced firing (Gun Action No.1) at 1717.
Ceased fire at 1719, fishing boat burning. Secured from Battle Surface. Fishing boat sunk at 1721.
No survivors spotted.


October 13, 1942

Submerged six nautical miles South-East of Cape Nosappu, Hokkaido before dawn (0944 local)
for patrol in the area. Spotted a fishing boat anchored in cove, bearing 001 11,000 yards at 1134.
Surfaced at 2208.


October 14, 1942

Seas came to a flat, icy calm in pre dawn hours, as NAUTILUS was twenty miles South-West of Etorofu Island,
preparing for submerge for the day. Enjoyed a beautiful arctic sunrise, then submerged at 1035 for patrol
to interdict any shipping pass between Kunashiri and Etorofu Islands. Surfaced at 2230, turned course
050 to patrol North Coast of Etorofu Island.


October 15, 1942

Submerged for patrol North of Etorofu Island at 1130.Surfaced at 2230.



October 16, 1942

Submerged at 1030 for patrol. Surfaced at 2200 South of Etorofu Island.


October 17, 1942

Submerged at 1030 for patrol. At 1045, sound reported several prop noises in distance bearing 070.
Due to distance, after SJ sweep made no contact, surfaced to investigate. Initial SJ contact at bearing 001
turned out to be a large iceberg. Disappointed, began to turn South, when lookout S1c L.B. Davis spotted in the distance,
a smoke plume in spite of the moderate fog and haze in area. Full Speed was ordered and at 1306
SJ made contact bearing 335 19460 yards.Ordered flank speed to close, turned to course 068
to shadow convoy at ten miles, pull ahead for submerged attack.

Called GENERAL QUARTERS-TORPEDO at 1430 and Submerged for attack at 1435. Repeated observations
revealed one mid sized AK escorted by a DD of the Minekaze Class on course 075 est speed 10 knots. DD
began to zig along its base case, possibly suspecting presence of submarine. Backed down to open range
from projected track. The AK kept on steady course so not was clear was not alerted, just suspicious, or
conducting routine escort operations.

AK identified as RYUSEI MARU 6538 tons. All tubes made ready to fire at 1537. Fired (Torpedo Attack No.2)
Tubes 1,2,3, at 1441. Torpedo No.3 immediately jogged to starboard at wide angle, apparently suffering gyro
malfunction. Fired Tube No.4 at 1551:45. Torpedoes 1 and 2 impacted target. Target damaged, slowed, causing torpedo
No.4 to miss just ahead of the bow. The DD obviously spotted the origin of the wakes, turned towards
NAUTILUS. A depth of 250 ft, rigged for silent running and depth charge was ordered. Thermal layer detected
at 107 ft.

Pinging began at 1546 as DD closed in fast.DD roared overhead at 1547, multiple splashes heard in water.
NAUTILUS leveled at 250 ft as multiple DC explosions shook the boat. Multiple DC explosions aster, distant.
Pinging began again at 1552. DD above at 1553, dropped multiple DC, splashes audible. Multiple DC explosions, boat shaken
damage reported (See Major Defects and Damage Section)

Depth charge exploded clsoe to conning tower at 1612 causing damage. Damage in multiple compartments reported. Minor flooding in conning tower due to busted piping, quickly stopped.

Sound reports noises of ship breaking up at last known bearing of RYUSEI MARU. Sounds grew
louder and audible through hull as well. Believe vessel sunk at 1625.


By 1820, it appeared enemy had lost contact with NAUTILUS as had been nearly one and half hours since last
depth charge, or ping, and sound reported DD astern, estimated 3000-4000 yards. Secured GQ,
maintained silent running at 350 ft depth, course 190, 3 knots. Sound lost contact with enemy DD at 1936 hours.

Periscope and SJ sweeps all clear at 2230, surfaced into cool night with calm seas.
Damage Control Party assigned to conduct repairs. Torpedoes ordered reloaded.


October 18, 1942


Set course at 0000 to patrol South of Akkeshi Bay, Hokkaido to clear area of last attack for a few days.
Submerged at dawn for patrol, surfaced at 2200.


October 19, 1942

Weather begin to once again deteriorate around 0430 with Overcast, medium precipitations,
heavy fog, and 10-12 ft seas with winds at 12-15 knots, direction 061. A sharp drop in temperature was also noted.


October 20, 1942

Foul weather conditions carried over from 19 October and remained same throughout the day.


October 21, 1942

Skies cleared around 0500, but moderate precipitations and choppy seas remained until
1300, when seas calmed and skies cleared for a pristine, but cold afternoon.


October 22, 1942

Submerged at 1100 for patrol twenty miles south of entrance to Akkeshi Bay.
As preparing to surface, observed two fishing boats bearing 021 10,000 yards.
At 2126 called GENERAL QUARTERS-BATTLE SURFACE GUN ACTION.

Blew tanks for rapid surface at 2140. Commenced firing at 2141 (Gun Action No.2)
Forward 6' 53 Caliber gun found to be inoperable, surely damaged in depth charge attack of
17 October.

Fishing boat (Target No.1) sunk by gunfire at 2144. Second fishing boat (Target No.2)
turned away at best speed, turned NAUTILUS for pursuit course. As closed range,
fishing boat suddenly opened fire with machine guns, several rounds striking NAUTILUS. At least
one round went over the commanding officer and bridge crew's head, striking.
lower portion of periscope shears, but a well timed duck by all prevented disaster.

Fishing Boat (Target No.2) was quickly dispatched by two hits from aft deck gun.
2152 ceased fire and secured from Battle Surface.




October 23, 1942

Submerged before dawn eleven miles ESE of Daikokujima Island for patrol.
Surfaced at 2230.


October 24, 1942

Submerge before dawn six miles SE of Cape Nosappu for patrol.
While at radar depth for SJ sweep,(Aircraft Contact No.3)
SD contact , range 12,000, closing. Went to periscope depth.
At 2011 spotted the contact bearing 253. Ordered depth of
150 ft until nightfall. Surfaced at 2214.




October 25, 1942

Delayed morning dive due to storms in area. Weather cleared
just before noon and submerged at 1218 for last day in assigned area.
Surfaced at 2148. SJ contact was made at 2159 bearing 200 18,228 yards. Turned to course 259 to intercept.Smoke sighted at 2204. GENERAL QUARTERS-TORPEDO called. Submerged for attack at 2208.

Conducted approach on vessel identified in fading light
as a mid sized AK, making a "u turn" to bring stern tubes to bear.
At 2246, tubes 5 and 6 made ready for firing.
(Torpedo Attack No.3) Fired tubes 5 and 6, at 2250.
First torpedo hit at 2252:30, failed to detonate-dud.
Second torpedo hit at 2252:36, detonated, large fireball.
Lost targets engine noises on sound, engines ceased.

Ordered a turn to bring bow tubes to bear, as
stern tubes emptied. Target dead in water at 2311. Tube No.5 reload, stern tubes brought to bear. Tube No.6 reported reloaded at 2314. Fired tubes 5,6 at 2315 (Torpedo Attack No.3-A). At 2315:50 torpedo prematurely detonated. At 2325:56 and just yards from target, torpedo prematurely detonated. Due to proximity, it was thought this torpedo was a hit initially.
Turned about to fire bow tubes. (Torpedo Attack 3-B) fired tubes 1,2,3. Torpedoes 1 and 3 prematurely detonated. Torpedo 2 hit
target, causing a serious list to starboard and fire amidships.
AK KOTO MARU 4466 tons sunk at 44-40N 148-00E.

Due to fuel status and time on station expired, set course 115 to depart patrol area for Pearl Harbor via Midway andSecured General Quarters.


October 26, 1942

En route Pearl Harbor via Midway.



October 27, 1942

En route Pearl Harbor via Midway.


October 28, 1942

En route Pearl Harbor via Midway.


October 29, 1942

En route Pearl Harbor via Midway.


October 30, 1942

En route Pearl Harbor via Midway.


October 31, 1942

En route Pearl Harbor via Midway.


November 1, 1942

En route Pearl Harbor via Midway.



November 2, 1942

En route Pearl Harbor via Midway.



November 3, 1942

En route Pearl Harbor via Midway.


November 4, 1942

En route Pearl Harbor via Midway.


November 5, 1942

Arrived at Midway and docked at 0630 to refuel. Refueled and departed
for Pearl Harbor at 1300.


November 6, 1942

En route Pearl Harbor


November 7, 1942

En route Pearl Harbor


November 8, 1942

En route Pearl Harbor


November 9, 1942

Arrived Submarine Base Pearl Harbor at 0800. Terminated war patrol





CONTACTS


Aircraft Contacts


No.

1. 1942/09/15 1054 (local)
21-20N 158-30W
Brg.353 Rng. 8,700 yards
Crs. 090 Spd. 100knots
Alt. 800 ft Type-PBY (USN)
How-Visual, SD power off.

2. 1942/10/07 1543
41-57N 144-55W
Brg.248 Rng. 9,000 yards
Crs. 070 Spd. 120 knots
Alt. 2000 ft Type-H6K 'MAVIS'
How-Visual-No.2 periscope.

3. 1942/10/24 2020
Brg. 253 Rng. 12,100 (initial) 6,000 yards (visual)
43-34N 145-42E
Crs. Unknown Spd. 100 knots
Alt. 500 ft Type- H6K 'MAVIS'
How- SD (initial). Visual





Ship Contacts


No.

1. 1942/10/2 1936 (local)
44-5N 137-31E(estimated)
Brg.308 Rng.18,228 yds.
Crs. 040 Spd. 8 knots (estimated)
Type-Unknown, no visual made due to storms.
How- Radar-SJ


2. 1942/10/03 1158 (local)
44-43N 148-30E
Brg.231 Rng.20,253 yds.
Crs. 060 Spd. 8 knots
Type-Unknown, no visual made due to storms.
Later observed to be AK ANZAN MARU
Torpedo Attack No.1 (sunk)
How- Radar-SJ (initial), Visual (later)


3. 1942/10/12 1550 (local)
41-55N 144-56E
Brg.006 Rng. 6 NM
Crs. 245 Spd. 5 knots
Type-Fishing Boat 200 tons
How- Visual, SJ (later)
Gun Action No.1


4. 1942/10/13 1134 (local)
43-21N 145-51E
Brg.001 Rng. 11,000 yards
Crs. 090 Spd. 0 knots
Type-Fishing Boat 200 tons
How- Visual-No.2 Periscope.
Anchored in cove, observed at dawn.


5. 1942/10/17 1306 (local)
44-42N 148-5E
Brg.001 Rng. 19460 yards
Crs. 070 Spd. 10 knots
Type-AK, DD
How- SJ-Visual
Torpedo Attack No.2




6. 1942/10/22 2114 (local)
41-55N 144-56E
Brg.021 Rng. 10,000 yards
Crs. 064 Spd. 5 knots
Type-Fishing Boat x2 200 tons each
How- Visual-No.2 Periscope.
Gun Action No.2





7. 1942/10/22 2159 (local)
44-38N 148-2E
Brg.200 Rng. 18,228 yards
Crs.065 Spd. 9 knots
Type- AK
How- SJ-Visual
Torpedo Attacks No. 3, 3-A, 3-B





ATTACK DATA


USS NAUTILUS SS-168
TORPEDO ATTACK NO.1
WAR PATROL FIVE

DATE 1942/10/03
TIME 1332
LAT 44-51N
LONG 148-34E

TYPE OF ATTACK
Periscope, Submerged-Day


Ships Sunk
ANZAN MARU AK
3936 tons
1942/10/03 1339
44-51N 148-34E

Verification-

Observed three torpedo hits amidships, forward mast, aft mast
in succession. Roughly one minute after last torpedo hit,
a series of large explosions ripped the vessel apart.
Vessel split into a "V" at the keel, sunk within minutes in two sections.
Observed both sink, the stern section sliding under last at 1339 hours.
No survivors observed.


Ships Probably Sunk
None

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (at firing)

NAME ANZAN MARU
CLASS AK
TONS 3936
COURSE 060
SPEED 10 knots
BEARING 350
TRUE BEARING 329
RANGE 969 yards
AOB 84 S
REMARK
Machine Guns/Auto-Cannon mounted stern, port, and starboard.
Shipping crates strapped to deck.



TORPEDO ATTACK NO. 1 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 28831
EXPLODER MK 6
SERIAL NO. 1990
GYRO 2 R
COURSE 341
TRACK 97 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [ ]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Per information received COMSUBPAC, set to minimum depth
due to malfunctions with depth control.


TUBE NO. 2
TYPE MK 14
SERIAL NO. 28832
EXPLODER MK 6
SERIAL NO. 1991
GYRO 2 R
COURSE 341
TRACK 97 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [ ]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Per information received COMSUBPAC, set to minimum depth
due to malfunctions with depth control.


TUBE NO. 3
TYPE MK 14
SERIAL NO. 28833
EXPLODER MK 6
SERIAL NO. 1992
GYRO 2 R
COURSE 341
TRACK 97 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [ ]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Per information received COMSUBPAC, set to minimum depth
due to malfunctions with depth control.



OWN SHIP DATA (at firing)

DEPTH 64 ft
COURSE 339
SPEED 1.5 knot
ANGLE 2-down
SEA STATE Light chop


------------------------------------------------------------------------------------------------------------



USS NAUTILUS SS-168
TORPEDO ATTACK NO.2
WAR PATROL FIVE

DATE 1942/10/17
TIME 1539
LAT 44-54N
LONG 148-22E

TYPE OF ATTACK
Periscope, Submerged-Day

Ships Sunk
None

Ships Probably Sunk
AK RYUSEI MARU
6538 tons
44-54N 148-22E
1942/10/17 1625 (local)

Verification-

Observed two torpedoes impact target. Target engines ceased, went dead in water.
Sound operator reported the tell tale sounds of a ship in distress, breaking out. Soon,
these sounds were clearly audible through hull. Sounds originated from last
bearing of target, indicating target sunk.

Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (at firing)

NAME RYUSEI MARU
CLASS AK
TONS 6538
COURSE 075
SPEED 9 knots
BEARING 350
TRUE BEARING 339
RANGE 1240
AOB 86 S
REMARK
Tanks lashed to deck.



TORPEDO ATTACK NO. 2 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO. 1
TYPE MK 14
SERIAL NO. 28835
EXPLODER MK 6
SERIAL NO. 1994
GYRO 1 R
COURSE 350
TRACK 98 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit observed just forward of amidships. Per information received COMSUBPAC, set to
minimum depth due to malfunctions with depth control.


TUBE NO. 2
TYPE MK 14
SERIAL NO. 28836
EXPLODER MK 6
SERIAL NO. 1995
GYRO 1 R
COURSE 350
TRACK 98 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit observed amidships. Per information received COMSUBPAC, set to
minimum depth due to malfunctions with depth control.


TUBE NO. 3
TYPE MK 14
SERIAL NO. 28837
EXPLODER MK 6
SERIAL NO. 1996
GYRO 1 R
COURSE 350
TRACK 98 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [X] No [ ]
REMARK
Upon launch, torpedo took a hard jog to starboard, way off
of directed firing bearing/track. Likely suffered a gyro
malfunction/failure. Torpedo eventually detonated itself about one minute
after firing, as observed through periscope by CO and heard by entire crew.


TUBE NO. 4
TYPE MK 14
SERIAL NO. 28838
EXPLODER MK 6
SERIAL NO. 1997
GYRO 1 R
COURSE 350
TRACK 98 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION End of Run
MALFUNCTION Yes [ ] No [X]
REMARK
Delayed launch, launched after No.3 torpedo suffered apparent
gyro failure. Target, damaged by two torpedo hits, slowed enough
causing No.4 torpedo to miss just ahead of the bow
aby less than 10 feet. Torpedo reached end of run,
end of run explosion audible through hull.



OWN SHIP DATA (at firing)

DEPTH 64 ft
COURSE 350
SPEED 2 knots
ANGLE 1-down
SEA STATE Calm, flat, glassy.

--------------------------------------------------------------------------------------------


USS NAUTILUS SS-168
TORPEDO ATTACK NO.3
WAR PATROL FIVE

DATE 1942/10/25
TIME 2250
LAT 44-40N
LONG 148-00E

TYPE OF ATTACK
Periscope, Submerged-Night

Ships Sunk
None

Ships Probably Sunk
None


Ships Damaged

AK KOTO MARU 4466 tons



Ships Probably Damaged
None


TARGET DATA (at firing)

NAME KOTO MARU (similar to)
CLASS AK
TONS 4466
COURSE 065
SPEED 9 knots
BEARING 180
TRUE BEARING 340
RANGE 780
AOB 90 S
REMARK




TORPEDO ATTACK NO. 3 TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO.5
TYPE MK 14
SERIAL NO. 28951
EXPLODER MK 6
SERIAL NO. 2050
GYRO 14 S
COURSE 174
TRACK 69 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Failed to acutate
MALFUNCTION Yes [X] No [ ]
REMARK
Torpedo impacted MOT, but failed to detonate. Audible clang heard
via sound gear and through hull.




TUBE NO.6
TYPE MK 14
SERIAL NO. 28952
EXPLODER MK 6
SERIAL NO. 2052
GYRO 14 S
COURSE 174
TRACK 69 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Failed to acutate
MALFUNCTION Yes [ ] No [X]
REMARK
Crippled target.


OWN SHIP DATA (at firing)

DEPTH 64 ft
COURSE 150
SPEED 2 knots
ANGLE 1-down
SEA STATE Calm, flat, glassy.


-----------------------------------------------------------------------------------

USS NAUTILUS SS-168
TORPEDO ATTACK NO.3-A
WAR PATROL FIVE

DATE 1942/10/25
TIME 2315
LAT 44-40N
LONG 148-00E

TYPE OF ATTACK
Periscope, Submerged-Night

Ships Sunk
None

Ships Probably Sunk
None


Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (at firing)

NAME KOTO MARU (similar to)
CLASS AK
TONS 4466
COURSE 350
SPEED 0 knots
BEARING 178
TRUE BEARING 251
RANGE 1000 yards
AOB 89 S
REMARK
Crippled, dead in water, from hit in
Torpedo Attack No.3


TORPEDO ATTACK NO. 3-A TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO.5
TYPE MK 14
SERIAL NO. 28952
EXPLODER MK 6
SERIAL NO. 2051
GYRO 357 R
COURSE 070
TRACK 93 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely detonated.


TUBE NO.6
TYPE MK 14
SERIAL NO. 28953
EXPLODER MK 6
SERIAL NO. 2052
GYRO
COURSE
TRACK
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely detonated.



OWN SHIP DATA (at firing)

DEPTH 64 ft
COURSE 200
SPEED 2 knots
ANGLE 1-down
SEA STATE Calm, flat, glassy.




---------------------------------------------------------------------------------------

USS NAUTILUS SS-168
TORPEDO ATTACK NO.3-B
WAR PATROL FIVE

DATE 1942/10/25
TIME 2326
LAT 44-40N
LONG 148-00E

TYPE OF ATTACK
Periscope, Submerged-Night

Ships Sunk

AK KOTO MARU
4466 tons
1942/10/25 2329
44-40N-148-00E

Verification-

Observed torpedo hits crippled vessel.
Observed vessel catch fire, listed to starboard,
and sink.

Ships Probably Sunk
None


Ships Damaged
None

Ships Probably Damaged
None


TARGET DATA (at firing)

NAME KOTO MARU (similar to)
CLASS AK
TONS 4466
COURSE 350
SPEED 0 knots
BEARING 357
TRUE BEARING 235
RANGE 1000 yards
AOB 89 S
REMARK
Crippled, listing, dead in water, but afloat. Damage is from hit in
Torpedo Attack No.3



TORPEDO ATTACK NO. 3-B TORPEDO FIRE CONTROL DATA (at firing)

TUBE NO.1
TYPE MK 14
SERIAL NO. 28940
EXPLODER MK 6
SERIAL NO. 2050
GYRO 355 R
COURSE 046
TRACK 63 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [ ] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [X] No [ ]
REMARK
Prematurely detonated.


TUBE NO.2
TYPE MK 14
SERIAL NO. 28941
EXPLODER MK 6
SERIAL NO. 2051
GYRO 355 R
COURSE 046
TRACK 63 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [X] No [ ]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic-Contact
MALFUNCTION Yes [ ] No [X]
REMARK
Hit. Target listed further to starboard, large fire amidships
and began to burn.



TUBE NO.3
TYPE MK 14
SERIAL NO. 28942
EXPLODER MK 6
SERIAL NO. 2052
GYRO 355 R
COURSE 046
TRACK 63 S
METHOD Single Bearing
POA MOT
SPREAD 0
FIRING INTERVAL 5 secs
DEPTH 3.5
POWER Low [ ] High [X]
HIT Yes [] No [X]
ACTUATION Magnetic
ACTUAL ACTUATION Magnetic
MALFUNCTION Yes [ ] No [X]
REMARK
Prematurely detonated.



OWN SHIP DATA (at firing)

DEPTH 64 ft
COURSE 236
SPEED 2 knots
ANGLE 1-down
SEA STATE Calm, flat, glassy.


--------------------------------------------------------------------------------------


USS NAUTILUS SS-168
GUN ACTION NO.1
WAR PATROL FIVE


DATE 1942/10/12
TIME 1722
LAT 41-54
LONG 144-54E



ACTION NARRATIVE

While on surfaced patrol in heavy seas, following storm clearing. OOD observed a fishing boat
bearing 006 at six miles. Submerged and closed to review boat. Upon review, decided to dispatch by gunfire.
Upon surfacing, boat attempted to evade, so commenced firing a broadside with both six inch guns, fore and
aft fifty caliber machine guns. Estimed 200+ .50 MG hits were achieved on the boat. The six inch guns had
some initial trouble due to sea state, but began to score hits, which quickly wrecked the wooden hulled boat.A large fire burned profusely, followed by few explosions. Boat quickly capsized to starboard,
with no survivors visible.



GUN ACTION NO.1 TARGET DATA (at firing)

CLASS Fishing Boat
TYPE Sail/Motorized
TONS 200
BEARING 075
TRUE BEARING 177
RANGE 2300 yards
COURSE 245
SPEED 8
REMARK
Caught fire, sunk.

GUN ACTION NO. 1 DATA (at firing)


ROUNDS EXPENDED

6' 53 Caliber- 11 HE

Hits-
4


.50 Caliber Machine Gun- 507 AP

Hits- 200+


OWN SHIP DATA (at firing)

DEPTH Surfaced
COURSE 245
SPEED 5 knots
RELATIVE ANGLE TO TARGET 85-90.
SEAS Heavy roll and chop


------------------------------------------------------------------------------

USS NAUTILUS SS-168
GUN ACTION NO.2
WAR PATROL FIVE


DATE 1942/10/22
TIME 2141
LAT 42-21N
LONG 144-46E



ACTION NARRATIVE

While scanning the area in preparation for surfacing the boat at dusk, observed two fishing boats
at 10,000 yards. Closed ranged, and surfaced for gun action. Upon ordered to commence fire, it was discovered
that the forward six inch deck gun was not operational, later found to be due to damage not previously
detected following depth charge attack of 17 October. Forward .50 cal machine gun and aft deck gun
quickly set the fishing boat on fire, which would sink soon after.

The second fishing boat was now on a course opposite NAUTILUS presenting a poor target,
so speed was increased to close target before firing. At 3000 yards, as target suddenly swung hard to port,
"Crossing the T" of NAUTILUS, and opened fire with machine guns. A few rounds of initial bursts struck NAUTILUS
forward deck, bridge sail structure, with a few flying just above the heads of the CO, OOD, and bridge crew
,striking the lower and mid sections of periscope sheers. A well timed duck by all crew
prevented injuries. The forward .50 caliber machine crew laid effective suppressing fire on the
fishing boats gun(s) as NAUTILUS swung to starboard, bringing the aft deck gun and machine gun to bear.
Four rounds and two solid hits from six inch gun, in addition to numerous continued machine gun hits
left the fishing boat a flaming wreck. Firing was ceased and boat quickly slipped beneath the waves.
No survivors from either boat were observed.



GUN ACTION NO.2 TARGET DATA (at firing)

TARGET NO. 1 GUN ACTION NO.2

CLASS Fishing Boat
TYPE Sail/Motorized
TONS 200
BEARING 330
TRUE BEARING 230
RANGE 4000 yards
COURSE 065
SPEED 5
REMARK


TARGET NO. 2 GUN ACTION NO.2

CLASS Fishing Boat
TYPE Sail/Motorized
TONS 200
BEARING 340
TRUE BEARING 240
RANGE 3000 yards
COURSE 065
SPEED 5
REMARK




GUN ACTION NO. 2 DATA (at firing)


ROUNDS EXPENDED

6' 53 Caliber- 21 HE

Hits-
6



.50 Caliber Machine Gun- 417 AP

Hits- Numerous


OWN SHIP DATA (at firing)

DEPTH Surfaced
COURSE 250/150
SPEED 5-10 knots
RELATIVE ANGLE TO TARGET 90/0 P
SEAS Calm





WEATHER


Weather conditions proved a challenge during this patrol. While the initial transit to area
was pleasant, upon crossing 40 degrees latitude frigid temperatures, along with frequent gales
made transit difficult.

Weather in patrol area, majority of the time was full of storms, heavy seas, winds, rain,
, sleet, snow, and fog. A few days saw cold, but near cloudless skies, with calm seas or light chop.


TIDAL INFORMATION

Tides in area were found to be normal as reported.


NAVIGATIONAL AIDES

The various islands of the Southern Kurils as well as lights and installations of Hokkaido
provided navigational aides while in area.



MINES

No mines were encountered on this patrol



ANTI SUBMARINE COUNTERMEASURES AND EVASION

Enemy ASW patrol presence was surprisingly limited in this area. No ASW patrol vessels were
spotted and just a few patrol aircraft.


Depth Charge Attack No.1
1942/10/17
1547-1820 (local)

The depth charge attack of 17 October was intense, and professional, yet somewhat brief
compared to past counter attacks NAUTILUS has endured. Enemy utilized passive and active sonar,
conducted numerous runs typically 5-10 minutes
apart, some in repeated order. Most depth charges appeared set too shallow of depth
in most cases. A total of fifty nine depth charge explosions were counted.

NAUTILUS suffered serious damage in this attack, for details see MAJOR DEFECTS AND DAMAGE.


Evasion

Evasion tactics were standard. Silent Running, combined with repeated course and speed changes
for duration of attack. Thermal layers were also utilized in addition to "bursts" of speed as required,
primarily when enemy DD was above preparing to drop.

NAUTILUS , rated to a test depth of 300 ft, was again required to descend to a depth of 370 ft
during this attack to evade. This extra 70 feet was handled well as before.


MAJOR DEFECTS AND DAMAGE


No major defects occurred on this patrol.


Damage occurred due to depth charge attack of 17 October. All damage repaired at sea, unless otherwise
noted.


1. Forward 6' 53 Caliber Gun- Rendered non operational, repaired in port.

2. Trim Pump

3. Hydraulic Pump-Disabled for twenty four hours

4. SJ Radar Cabinet

5. SJ Radar Antenna

6. Conning tower flooding-Pumped

7. WCA Sonar Stack (conning tower)

8. Compressor

9. No.2 Periscope

10. Forward Batteries

11. Piping Leaks

12. High Pressure Air Line leaks.


RADAR

SJ

The new SJ surface search radar performed quite well, enabling to locate targets would have likely not
without it. Typical detection range was 18000-20000 yards. The three crewman, quickly trained in its operation
during last refit period proved excellent operators, as did our "guest" operator from the radar school.


SD

SD Radar performed well with typical detection range of 8000-11000 yards.



RADIO


Radios performed well overall during this patrol.



SOUND GEAR AND SOUND CONDITIONS

Sound gear performed moderately well.

The cold waters, currents, and general conditions of the area were not ideal
for underwater sound gear.



THERMAL LAYERS

One thermal layer was detected at 106 feet
on 17 October at 44-54N 148-22E



PERSONNEL

Crew performance was excellent in spite of trying weather conditions in transit and in patrol area.

Two Officers and five men earned qualification during this patrol.


HEALTH AND HABITABILITY

Conditions aboard the boat were difficult at times due to the foul weather
which dominated transit to/from area and while on station. However,
hearty, well prepared meals, and the success of sinking three enemy vessels
by torpedo, and three small vessels by gunfire helped maintain morale.



Following suffered injuries during the 17 October depth charge attack:

LT R.B. Lynch, USN. (XO)
ENS N.B. Baker, USN.
RM1c N.B. Cox, USN.
RM2c D.H. Rosencrans, USN.
RdM2c B.I. Schmidt, USN.

All injured were at battle stations in conning tower when a depth charge detonated close
aboard. All injuries treated and healed at sea, with exception of RM1C's broken arm and hand.



MILES STEAMED-FUEL CONSUMED


Pearl to Midway
1350 miles 18560 gallons

Midway to Area
2470 miles 42800 gallons

In Area

6250 miles 70240 gallons

Area to Midway
2500 miles 43444 gallons


Midway to Pearl
1350 miles 19600 gallons



DURATION

DAYS
Pearl to Midway 4

Midway to Area 11

In Area 30

Area to Midway 13

Midway to Pearl 4

Days Submerged 30



FACTORS IN ENDURANCE


Torpedoes: 6

Fuel 27500 gallons

Provisions 21 days

Crew Indefinite


Reason for termination of patrol:

Fuel and time on station expired.



REMARKS


Another successful, busy, and challenging patrol for the NAUTILUS and her crew. Aside from enemy depth crarges,
the weather proved the most formidable opponent on this patrol. Fall/Winder weather in the Kurils and off Northern Japan
at sea, is less the hospitable. Perhaps explains he relatively light traffic encountered, perhaps in summertime
the sea lanes are more active.


Torpedo malfunctions continued to occur on this patrol, but were not as frequent in the first two attacks.
Torpedo Attack No.3 proved frustrating, requiring the firing of seven torpedoes to sink one vessel, for just two
hits. Premature detonations occurred, along with one 'dud'. No torpedoes are believed to have missed due to depth control
issues as on previous patrols due to setting torpedoes to minimum depth, but believe they still ran deeper than set.


In spite of challenges from weather, enemy depth charges, and torpedo malfunctions, three important
merchantman were sunk by torpedo and three fishing boats by gunfire.


W.H. Brockman Jr, LCDR, USN.















































October 18, 1942



October 19, 1942
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Old 02-09-22, 05:38 PM   #5217
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Default USS NAUTILUS WAR PATROL SIX 13 December 1942-25 February 1942

TMO 2.5 Update BH V 2.0 (not yet released, in testing)
Donation Narwhal Mod
100 difficulty, cams and contacts off.


WAR PATROL REPORT
USS NAUTILUS SS-168
WAR PATROL SIX
13 DECEMBER 1942-
26 February 1943


USS Nautilus, under W.H. Brockman Jr., USN, departed Submarine Base Pearl Harbor, T.H. at 0700 hours on 13 December 1942 for assigned patrol area east of Bougainville. The assigned area covered the approaches to Kieta Harbor as well as the Bougainville Strait and approaches to Tonolei Harbor on Southern Bougainville.

Upon departure conducted underway routine of dive, gunnery, torpedo fire control, and emergency drills. Arrived at Johnston Island on 15 December and topped off fuel tanks, then proceeded on course 235 at 10 knots. The route chosen took NAUTILUS between the Marshall and Gilbert Islands en route to assigned area. A SD contact at 11000 yards was made at 1739 on 17 December. NAUTILUS submerged and remained so until dusk, surfacing at 2020.


NAUTILUS arrived in patrol area at midnight on 25 December and submerged 25 miles off Kieta for patrol just after dawn. Surfaced that evening after a uneventful day and proceeded to Southern portion of area.


TORPEDO ATTACKS NO. 1, 1-A, 1-B.

On 27 December, north of the Bougainville Strait between Bougainville and Choiseul Island, SJ contact was reported bearing 001 at 18000 yards. Established visual contact at dawn, contact was a enemy patrol boat, NAUTILUS turned to avoid and submerged for patrol.


At 1420, sound reported high speed screws bearing 170 closing. Went to periscope depth and at 9000 yards spotted a enemy destroyer. General Quarters-Torpedo was called and initiated a approach. Destroyer was
soon identified to be of the Asashio Class on course 335 at 16 knots.

Next observation revealed a slight course change by DD put NAUTILUS too close for bow shot, so turned to starboard to bring stern tubes to bear.
Torpedoes were set to minimum depth due to ongoing depth control issues with MK 14 torpedo. At 1454 fired tubes 5, and 6, at 1300 yards from target.

First torpedo (Tube No.5) hit the target just aft of amidships area, causing large fire. Second torpedo (Tube No.6) passed below the stern but failed
to explode. The DD soon settled by the stern and slowed. Damage is believed to be caused by the magnetic detonator being actuated. Torpedo, set to minimum depth, obviously ran deeper than set, but was close enough to the hull of target to actuate the magnetic exploder.


As DD went dead in water, ordered stern tubes reloaded for the coup de grace. However, sound reported fast screws, warship closing from 157 degrees. Soon could see a PC type vessel closing at high speed, likely called in to assist the DD. Brought bow tubes to bear on the DD, now dead in the water and fired Tube No.1 at 1515:10. At 15:15:25 torpedo prematurely detonated. At 1515:45 fired tube no.2. Second torpedo hit, running into the side the stricken DD as aimed, blowing a large hole amidships, causing explosions and fire. The destroyer quickly sunk at position 6-29S 156-10E at 15:21 hours.

A fast patrol, PT boat boat was now closing at very high speed. NAUTILUS went to 250 feet, rigged for silent running and depth charge on a course NW, away from scene. Ten minutes later enemy arrived on scene and began a search pattern. After two passes in general area of NAUTILUS, the vessel surprised NAUTILUS with pings, as did not figure such a diminutive craft would have active sonar. As vessel roared above, two splashes of depth charges were heard, followed by two close explosions, which caused minor damage (piping, air line leaks, broken bulbs and glass)

The enemy continued to hound NAUTILUS through the afternoon and into evening. At 1951 , while NAUTILUS was at 325 ft, a three close depth charge explosions caused damage throughout the boat. Most serious was aft battery damage and minor flooding in control room, which was quickly stopped.

While the vessel continued searching, this was the last of depth charges dropped. Finally at 0025 on 26 December, contact was lost with the enemy.
Came to periscope depth at 0230 and radar depth, with no contacts, secured silent running and surfaced, headed away from the area of action.


NAUTILUS conducted submerged patrol SE of Kieta within 5 miles of Bougainville coast by day 26-28 December before moving back South to patrol off Bougainville Strait.


At 0400 on 29 December, received orders from COMSUBPAC regarding special mission to evacuate civilians from Teop, Bougainville on 30 December.
Proceeded NNW at 11 knots to arrive on time for the operation.



SPECIAL MISSION

Orders specified NAUTILUS to send a landing party ashore at Teop on 29 December, to rendezvous with British and Australian citizens
, including children, and evacuate them before daylight 31 December.
Executive Officer LT R.B. Lynch, USN, was chosen to lead the six man party.

Submerged ten miles off Teop on 29 December and reconnoitered the area. Surfaced at 2100 and prepared to land party when received message to delay operation until 31 December.


Landing party sent ashore via raft at 0400 on 31 December. Pickup would be arranged upon signals from landing party or, if contact was last. NAUTILUS was be at same position from 0000-0530 each night until recovery made.

Received signals at 2230 31 December for pickup of landing party and civilians at 0200 on 1 January 1943. NAUTILUS closed to 2500 yards
of shore and spotted rafts containing the landing party, twenty six adults, and three children. All were aboard by 0400, NAUTILUS departed area, and
at 0415 received orders to transport passengers to Brisbane, Australia.
A course taking NAUTILUS around the North end of Bougainville through the Solomon and Coral seas to Brisbane at 14.5 knots was plotted and executed.


TORPEDO ATTACK NO.2

However, SJ made contact at 0545 bearing 341 18228 yards. Contact soon developed into a convoy with a DD escorting. NAUTILUS pulled ahead and submerged at 0808 for attack. Normal approach was conducted but upon next observation, convoy had zigged to course 210, a strait line for Kieta Harbor. This put NAUTILUS in position to attack the port column, instead of the starboard as expected. Target selected was a large troopship similar to KONRON MARU 8100 tons, in the middle of the port column.

At 0910:30 fired tubes-1,2,3,4 at target. Torpedoes 1,2,3 all prematurely detonated en route to target. These detonations alerted the convoy, as ships slowed and began turning away, as DD turned about to close the NAUTILUS. However, No.4 still found its point of aim, as impacted the target between her twin stacks at 0912:15. The large AP heaved, from a explosion and fired. A large hole was visible at waterline between the stacks, with fire emanating from the gaping hole in the ships side.


NAUTILUS went to 250 ft, silent running, and rigged for depth charge. The DD, believed to be of the Akatsuki Class, closed in pinging, dropping numerous charges, but none close. However, at 1104, with NAUTILUS at 275 ft, several close charges shook the boat. Damage was reported to forward batteries and hydraulic pumps were seriously damaged. This damage caused noticeable performance changing in rudder and dive plane controls, the boat felt more slugging than usual when submerged. A Damage Control Party was dispatched. At 1135 more close depth charges caused damaged in forward torpedo room, including minor flooding, which was quickly handled.


After several hours of depth charging, enemy lost contact t 1436. NAUTILUS continued on, secured GQ and silent running at 1800 and conducted repairs, surfacing at 2200 to continue on to Brisbane.



At 01010 on 2 January, SJ contact was made on three ships at 19000 yards, bearing 280. Upon closing found one DD escorting two large transports on NW course. With heavy seas and low visibility, struggled to pull ahead for dawn attack as convoy was moving at 12.5 knots. At 0302, range on the DD began to decrease rapidly and lookouts spotted him bearing 205 3000 yards, charging in "with a bone in his teeth". About to be overran by the DD,
NAUTILUS submerged , stopping at periscope depth, hoping to catch the DD with a stern torpedo shot. However, the setup was not favorable. Ordered rig for silent running and depth charge, and a depth of 250 feet. Due to limited visibility and it being unlikely the DD visually observed NAUTILUS, it is believed the DD, a fleet type, may have surface search radar and/or radar detection equipment, which permitted him to detect NAUTILUS.

The passed above and dropped two depth charges, no close. For next twenty minutes, the DD searched for NAUTILUS, then suddenly, began pinging the NAUTILUS. A persistent and at times accurate depth charge attack followed for next six and a half hours. Finally, contact left area at high speed, likely to catch up with his charges.


Just after coming to periscope depth at 1130, sound detected fast props closing, visual check of bearing 300, a second DD arriving on scene, likely dispatched from Buka, Bougainville to hunt for NUATILUS, which went back to 300 feet and maintained silent running, but secured from GQ.


At 1500, with the DD astern but noises audible, sound picked up a contact bearing 000 10000 yards estimated. Sounds appear to be of a submarine.
NAUTILUS crept to periscope depth and spotted a Japanese I-Class submarine on course 330 at 14 knots 6000 yards, range opening. NAUTILUS was unable to fire due to being out of position, unable to surface and attempt to attack due to proximity of the DD astern and enemy airbase less than 30 miles at Buka. Returned to 300 feet and surfaced after dark.


January 3-8 was uneventful as proceeded to Brisbane, scheduled for arrival on 9 January.


On 9 January docked at Brisbane, disembarked passengers and received orders to depart on 12 January for patrol area in the Truk-Rabaul shipping lanes. Crew enjoyed brief liberty periods, boat was refueled, provisioned, and rearmed. NAUTILUS departed Brisbane at 0900 on 12 January for new patrol area.


FRIENDLY FIRE INCIDENT

On 13 January at 1134 SD made contact at 11500 yards. A RAAF Catalina
soon came into view at bearing 085. The Catalina made high pass overhead at about 2000 feet, then made a fast, sharp, banking turn, and then diving toward NAUTILUS. The dive alarm was sounded as the aircraft closed, fast. As NAUTILUS passed 64 feet, four large explosions went off, shaking the boat, causing busted piping, air lines, broken bulbs, and glass, as well as serious damage to tubes No.5 and No.6. Appears NAUTILUS was mistaken for a enemy submarine. (Friendly Fire mod in TMO Update) All damage was able to be repaired within 48 hours.


After a otherwise uneventful passage, arrived in patrol area 400 NM south of Truk in the Truk-Rabaul shipping lanes on 20 January. Conducted submerged patrol along these lines by day.


TORPEDO ATTACK NO.3

Finally at 0610 on 25 January, SJ made contact at 330 19300 yards, NAUTILUS went to GQ and conducted approach for dawn periscope attack
on a northbound convoy of three AK, one DD escorting.

At 0800, fired tubes 1,2,3,4 at a large AK similar to JOKUJA MARU. All four torpedoes prematurely detonated, one just 5-10 feet from target. Alerted, ships began to maneuver as DD closed. With stern tubes brought to bear, fired tubes 5,6, at a mid sized AK similar to KANAGA MARU. However, her Captain demonstrated skill and maneuvered to avoid the torpedoes, with both missed just ahead of her bow as she turned to starboard.

NAUTILUS rigged for depth charge, silent running and went to 275 feet, below a thermal layer, the first found on this patrol. The DD closed in pinging, dropping depth charges in area. At 1002 DD appeared to gain solid contact on NAUTILUS, roared above and dropped two large patterns. Boat was shaken, but no damage. With NAUTILUS at 300 feet, boat lost contact and last heard on sound leaving area at high speed with the merchants. Believe heavy seas and thermal layer hampered enemy attack efforts in this instance. Surfaced a hour later and attempted to regain contact with convoy but was unable. Ended search after dark and continued patrol.


After several days of rough seas and weather in area, clear skies and calm seas arrived on evening of 30 January.

TORPEDO ATACK NO. 4

At 0704 on 31 January, SJ made contact bearing 352 19240 yards/ Conducted approach for dawn periscope attack and went to General Quarters-Torpedo and submerged for attack at 0800.


On observation at 0830, noticed the six ship, two escort convoy had zigged to the east, opening range considerably from planned firing point. Not wanting to fire from long range, NAUTILUS went to 175 feet at 7.5 knots for a run to close the range much as possible. Slowly and coming to periscope at 0851, range had closed enough to ensure a tolerable firing range. Identified the lead escort as a Chidori Class Torpedo Boat/Escort Vessel, one which had a reputation as a nasty adversary of our submarines. Astern was a older DD of the Wakatake Class.


At 0856 fired tubes 1,2,3,4 at a large AK in center position of port column (two columns, three AK in each, six total) from 2100 yards. Torpedo No.1 impacted amidships as aimed, setting off a massive initial explosion followed seconds later by a massive chain of secondary explosions, which appeared to lift the vessel out of the water. The scene was obscured by flame and smoke, but observed torpedo no.2 hit the bow section. When smoke dissipated somewhat, could see the ships keel had been broken, split at amidships, the vessel was now in two sections. Torpedoes 3 and 4 failed to hit anything, reached their end of run explosions. The bow and stern sections of the AK hit by torpedoes quickly sunk, with one life raft visible.

Soon the Wakatake DD was closing NAUTILUS at high speed. NAUTILUS went to 300 feet, rigged for silent running, and depth charge. Depth charges exploded above as NAUTILUS passed 250 feet but no damage. The other escort, the Chidori soon arrived on scene and lived up to its reputation as, in what is NAUTILUS's most intense depth charging to date, Chidori delivered a large pattern which violently shook the boat. Damage was reported throughout the boat including:

Heavy Flooding in Aft torpedo room, minor flooding in forward torpedo, Aft batteries heavily damaged. Hydraulic pumps again disabled, trim pump damaged, numerous air line and piping leaks. Aft flooding was tended two, the weight of the water, caused a stern angle to be taken by NAUTILUS, requiring more speed to control while the assigned Damage Control Party
worked to stop the flooding. Both escorts made numerous runs on NAUTILUS during this period.

Flooding was stopped , but had several feet of water in bilges and aft torpedo compartment. With batteries damaged, could not afford the power to maintained high speed at all times. NAUTILUS drifted to 430 feet when was forced to add speed to get boat back to 390 feet. Eventually the boat was stabilized, but due to damaged batteries, and excess use of power to compensate for flooding, battery power was at just 30 percent.

At noon, one escort(believed to be the Wakatake DD) left area, presumably to rejoin the convoy, but the Chidori remained behind, hunting, pinging, dropping charges, several came close. The damaged NAUTILUS was at 375 feet, slowly moving along, attempting to conserve battery power as the enemy persisted. Several random explosions, not in area of the escort were heard through the afternoon. Believe this to be from ASW aircraft from Truk sent to assist.

At 1901, suddenly the Chidori regained contact, made four runs on Nautilus over next thirty minutes, causing some damage. NAUTILUS's battery power was now 19 percent. Next few hours, enemy commenced periods of listening, followed by pinging, dropping charges, most close and never appearing to lose general idea of NAUTILUS's location.

Finally, at 0102 on 1 February, Chidori made a final run, rushing above but about 100 yards off to port, dropped a large pattern, which shook the boat, then departed area at high speed.

After over a hour of all clear, NAUTILUS eased to periscope depth at 0200, then SJ depth at 0215. All clear, secured and surfaced. Battery power was down to just 6 percent of capacity. Upon surfacing repairs immediately began and torpedoes reloaded.


At 0500 , received orders to proceed to Woleai for reconnoiter and bombardment mission. Proceeded on course for Woleai at 8.5 knots to conserve fuel.Several SD contacts en route were made, but no planes sighted.


Arrived off Woleai on 5 February, conducted daytime observation, plotting location of large fuel tanks and a large ship in the lagoon. Surfaced at 2350
but seas were too rough for bombardment. Seas finally calmed sufficiently by 0300 and ordered General Quarters-Gun Action.

Fired 100 6" 53 caliber rounds from 7500 yards, destroying eight large fuel tanks and damaging a mid sized AK as well as PC type in the lagoon. Cleared area by 0500. Submerged at 0800 to avoid patrolling aircraft.

At noon, while at periscope depth, received message to bombard Fais Island.
Surfaced at dusk and proceeded to Fais Island at 8 knots.

Arrived off Fais on 7 February and submerged at dawn. Surfaced at dusk and conducted bombardment of island. Destroyed a H6K MAVIS flying boat moored at the island, as well six small fuel storage tanks. Secured from GQ and set course for Pearl Harbor via Johnston Island due to fuel status.


Submerged to avoid aircraft NW of Truk, SE of Guam on 9, 10, February, contacted by SD only. On the morning of 12 February, SD failed to detect a 'MAVIS', and lookouts spotted a MAVIS incoming bearing 170 8000 yards. NAUTILUS submerged and as was passing 115 feet, rocked by several large explosions. Fortunately, no damage reported. Remained submerged until dark and surfaced. On 22 February at 0600, docked at Johnston Island for fuel. Departed at 1200 and proceeded to Pearl Harbor. Arrived Submarine Pearl Harbor, T.H. at 1600 26 February 1943 and terminated war patrol.


SHIPS SUNK

Asashio Class Destroyer
2370 tons
1942/12/27 1455(local)
6-29S 156-10E


AKAMA MARU
AK-Cargo
5425 tons
1943/01/01 0854 (local)
1-25N 148-19E


SHIPS DAMAGED

AP KONRON MARU
8100 tons
1943/01/01 0912 (local)
5-32S 155-36E




A few screenshots......

































Last edited by Bubblehead1980; 02-09-22 at 05:49 PM.
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Old 02-09-22, 08:43 PM   #5218
Xboxman523
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Quote:
Originally Posted by Bubblehead1980 View Post
TMO 2.5 Update BH V 2.0 (not yet released, in testing)
Donation Narwhal Mod
100 difficulty, cams and contacts off.


WAR PATROL REPORT
USS NAUTILUS SS-168
WAR PATROL SIX
13 DECEMBER 1942-
26 February 1943
Good read! I'm curious does the donation narwhale feature the cutdowns to the rear aa gun platform it seems these subs had during the war?
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Old 02-09-22, 08:55 PM   #5219
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Quote:
Originally Posted by Xboxman523 View Post
Good read! I'm curious does the donation narwhale feature the cutdowns to the rear aa gun platform it seems these subs had during the war?

Thanks, it was a interesting/challenging/fun patrol. Going to see if can survive to end of war in the Narwhal. Can already tell it is going to be tough lol. Of course as time goes on will be involved in more special missions, making opportunistic attacks vs out hunting convoys etc, as the real boats did. Big, slow diving, sluggish, limited depth boat, can only imagine trying to use it in 1944/45 under heavy depth charge attack or on surface at night with escorts around or lol. Sure will found out soon.

Next patrol is May 1943, transporting/landing Army scouts to/on Attu as part of Operation LandCrab (invasion of Attu) in May 1943.

Unfortunately, it does not appear so. Looks like the donation Narwhal, as a custom built model, has a custom built conning tower and it only uses the early war model. However, I am working on solving that, the pseudo narwhal in TMO does have the cut down conning tower, hopefully will work with the donation model
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Old 02-10-22, 01:52 AM   #5220
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Good luck!
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