I'm having the same problem with a lone merchant right now. I've hit it with 3 of my 4 last torps and close to 100 HE shells. Many of these hits with the deck gun have been at very close range and many have been on or below the waterline. The medium tanker has been cheerily burning now for twelve hours and still cruising along at 7 kts. Something odd I noticed is that when I hit the ship I can see the holes in the side of the ship, but if I save the game and then reload it, the damage has dissappeared. This also seems to happen if I lose visual in the fog and rain.... when I reacquire it the holes have healed over.
SH4 Gold 1.5
RFB_v1.52_102408
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