I have just finished reading a book about the 7th U-Boat Flottilla which states that "some ships went down very quickly, but others remained stubbornly afloat and it was not too uncommon to encounter empty wrecks refusing to sink".
So I shouldn't worry too much about them going down as TGW creates the realism, unless you want to use most of your torps and gun ammo.
I also think hanging around will have brought back pretty soon as no doubt the merchants would have sent a message.
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