To stop and then go back they use "all machines back" so they do not wait till they stop floating to start moving back. Thus you see them moving all the time... I think.
Tips are:
- never be spotted,
- if spotted, sumberge and be silent (silent running),
- after launching your torpedoes don't stay there, just dive as deep, as you can and evade.
Read some topics here about evading escorts, some very good tips there!
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