I was at the end of one patrol where I had two torpedos left and came across a Large merchant I got into firing position and launched the first torpedo it was a dud. I launched the second and it impacted amidships followed the thing for 8 hrs real time until she came to a dead stop. Weather was bad so deck gun and flak guns were useless

I tried time compression and it stayed afloat, I had to leave as Warships were incoming fast. I will never know if it sank or not after I was out of visual range. The captain of that vessel was very lucky that day I'll tell you.