There have been many situations in which I have attacked a convoy and the escorts, immediately after the torpedo impact, started speeding towards my position by the centimeter in accuracy. This is with silent running on and moving at 1kt. This occurs to me even with electric torpedoes. Indeed, if the escorts did not head after me due to the compressed air (they found me after the torpedo impacts) they would have nothing else to listen to in order to find my position so accurately. And at the range I am normally at, they can't ping me. It's lunacy, absolute lunacy.
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