I currently in a Uboat. Type XXI. South East of the Torres Pass. I use the search planes a lot wih the uboats. you have so use them. I wish they were there on the United States side.
I had a plane spot a task force way to my south east. I moved down south easterly to intercept. I had marked to positions from the planes observations and drew a line up toward the north west. Feeling that they were heading tho the pass and not to Port Moresby I put myself west of the tract I drew for them and headed towards them.
7 hours later I came across 2 Battleships, 2 Heavy Cruisers, 2 Light Cruisers, a CLAA and numerous escorts of varying types. I had positioned myself ahead and slightly north of their current tract. The lead Destroyer passed me at 900 yards without a peep and I put 6 acoustic homing torpedoes in the North Carolina sinking her within 10 minutes. As I reloaded I fired and put 5 torpedoes in the Pennsylvania bringing her to a halt dead in the water listing about 40 degrees to port and being submerged about a 1/3 of her stern. A 6th torpedo missed and struck a Heavy Cruisers midsection in a huge explosion crippling her instantly and she sank soon after.
I moved off south after a moderate DC attack putting myself at 260 meters I moved away. I moved off sufficiently enough to rise to periscope depth and finding the Crippled Battleship 8000 yards north I fire my last three torpedoes. Two missed and 1 struck a Light Cruiser which had stopped close to the Battleship. The Cruiser sank. The BB was dead in the water and I had no more torpedoes to fire. I moved off and waited for sunrise and for the escorts to leave. My plan was to move in close enough to target the BB and radio it in in hopes that air support would come and finish her off.
My plan failed however as ALL of the remaining Cruisers and escorts remained by the BB moving to circle her as to pick off any torpedo advances. I was spotted since I had to get in closer for a visual targeting to radio in and was chased and sunk

. I felt the loss of the Uboat and her crew were worth the loss of the Battleships, and Cruisers I had torpedoed and that risk for a radio report was worth the sacrifice.