Hello,
I have the same problem that you are talking about: using a lot of torpedos for sinking a boat in an harbour.
I have found not a real solution, but an economic way to clean an area. Attack by night.
After sinking the patrol detroyer, I position my sub with a normal incidence at 450 Yard
of the ship. To sink the boat it takes me 1 or 2 torps depending on the size of the ship.
I do not attack super tankers because I can use all my torps I have never found the way to sink one in an harbour
But as Donut has highlighted, I think it is a bug of the 1.3 patch.
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