Go 220 m deep, if i remember right early war sonar can't reach you at that depth. You have a better chance of not being detected using T2 torpedoes that do not have wake. If you are being depth charged is not hard to dodge dc's at deep if you put your boat perpendicular to escorts, wait until they get close and order flank speed, more than once i survived more than 2 hours and hundred of DC's that way.
When escorts pass above you and they are getting away go flank speed as much as you can to try gain distance with luck you made enough space to avoid being pinged again as they keep doing circles.
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