Seems Mush Martin was dead-on,They did have a picket fence set up with 19 or so boats,I found this from a Naval Historical site
Submarines
Rear Admiral Robert H. English, USN
Commander Submarine Force Pacific Fleet (ComSubPac)
Pearl Harbor, Hawaii
Task Group 7.1 (TG 7.1)
Midway Patrol Group
USS Cachalot (SS-170)
USS Flying Fish (SS-229)
USS Tambor (SS-198)
USS Trout (SS-202)
USS Grayling (SS-209)
USS Nautilus (SS-168)
USS Grouper (SS-214)
USS Dolphin (SS-169)
USS Gato (SS-212)
USS Cuttlefish (SS-171)
USS Gudgeon (SS-211)
USS Grenadier (SS-210)
Task Group 7.2 (TG 7.2)
"Roving Short-Stops"
USS Narwhal (SS-167)
USS Plunger (SS-179)
USS Trigger (SS-237)
Task Group 7.3 (TG 7.3)
North of Oahu Patrol
USS Tarpon (SS-175)
USS Pike (SS-173)
USS Finback (SS-230)
USS Growler (SS-215)
I copied this info from this sitehttp://www.history.navy.mil/faqs/faq81-5.htm
It seems that in June of 42' the Silient Service was in it's infancy in group hunting tactics,unlike todays force.
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