The weather conditions are very important for surface attacks. In my opinion it must
1. Be night and with no moon (or low visibility)
2. If the visibility is good (i.e. "bright" night) then it helps is the sea is medium as the waves can conceal your boat.
3. Be at Decks awash, fire a full salvo from a large distance (4-3500m), keep approaching and reload. Once the first torpedo hit fire whatever torpedo you have load and dive deep trying to cross to the other side of the convoy.
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