Hey,
a) Your hydrophone has a dead zone in front and behind the boat (the angle depends on the hydrophone type). It might be that when you gave the order to track the destroyer the closest destroyer was in that zone.
b) If detected, try to lower your engine RPM to around 50 for actual silent running. The RPM gauges are close to the depth gauges.
c) The game usually gets ****ed when saving underwater. Are you using h.sie's hardcode fixes? They contain a fix for some issues with depth keeping when loading saves.
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