The best way to avoid visual detection in this game is to stay submerged! Surfaced night attacks worked better in RL than they do in this game. Sure, you can get into a convoy at night on the surface, but it's much easier submerged. And then you have to get out too, which is impossible at the surface with 30 searchlights looking for you. It will take much longer for escorts to find you if you are submerged, and since you have to be submerged to get out you might as well be submerged during the attack too.
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