It depends on your tactic. I found that intercepting the convoy for best attack position, and ambush it (preferably at night) let all tubes loose and just turn tail and dive at ahead standard to 150m. by the time the escorts are onto you, you are atleast 3km away.
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"Submariners are a bunch of intelligent misfits that somehow seem to get along,
understand each other and work well together"- Anon
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