Are you talking about how to escape from destroyers? I'm not an expert at how the expert crews are in the later game but there are some basic steps you can do to escape destroyers.
First thing you can do is dive under the thermal layer. I am pretty sure it's modeled in the game. I think it is around 50m (can someone clarify?). Being under the thermal layer makes you more difficult to detect with ASDIC. Once you dive deep try doing silent running and run at 1kt, switching your direction every now and then.
When a boat passes right over you, you can try exploiting the sonar weakness that is directly behind the destroyer. When it's above you go to flank speed and hard to port or starboard. As it gets further go to all stop and let the boat coast. I have had some success using these techniques.
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