Evading multiple destroyers can be a lengthily exercise. They may your location but no so much your depth keep silent go deep find a depth you are not getting depth charged so much. seek the closest enemy ship with sonar and try to sail 180degs from it. It can take hours sometimes you can use TC when they are reported at medium range but be careful it can be risky, avoid the temptation to increase speed even at longer ranges. They will normally disengage if they get split too far from the main fleet. It takes a lot of patience at the best of times. Try not to get spotted in the first instance if you can don't leave your scope up more than absolutely necessary.
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