I can't say what others do, but for me, I target the largest ship I can in the convoy and hit it with a two-torpedo salvo. As soon as I click fire I call for a dive. I don't change course at all because I find that changing course and diving at the same time causes boat speed to drop and increases the amount of time necessary to reach a good depth. I can usually hit 40 meters under before the torpedoes hit. I usually try to go to 160+ meters under. If I hit 140 meters under and still no pinging, I level off and resume my course to take me out and around the convoy again.
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