This is probably one of my best, but I didn't use the TDC, just guessed the lead as the thing was flying right by me at about 30 knots and came out of the rainy darkness, I'd picked it up on hydrophones, but couldn't see it - weather was too rough to even contemplate getting a set up, so I chanced firing all six tubes as straight runners based on a guesstimate from the bow wave, and I was rewarded with five hits! Huge European Liner, gone in about thirty seconds, leaving four destroyer captains with a lot of explaining to do! here's a pic (brightness tweaked in Photoshop, it wasn't anywhere near that clear in the game, except for when a big fireball lit up the surroundings).