[I'm goin' down]

When there is a single target, you can use sonar to track it, and the Dick O'Kane technique to shoot and sink it. I sunk a large modern split freighter in a rain storm at night with zero visibilty using sonar only. It was so nasty out, I could not see the target when I was surfaced. I never saw it until the torpedoes made impact, and then I saw a small flashes of light and heard the impacts. I intended to sink it with my deck gun, and I followed the fire started by the explosions from the torpedoes for about 30 seconds using the deck gun's target magnifcation, and then it faded into the night. I could not tell if it sank. I searched for 15 minutes to find it, and the captain's log did not record a kill. Then, all of sudden, the event camera switched on, and I saw its flag go under the water. All that for a 30 second visual!! (Wah!) See Rockin Robbins tutorial on sonar for the technique if you have not mastered it already. These attacks take a long time to execute, so have some Mai Tai's by your side, as that is part of RR's tutorial and appear to be indispensible to the attack technique.