At 80 metres I would say is the minimum depth.
The orange hydrophone sensor at this depth will have disappeared on the DD.
You can do some testing using Historical Missions and in TDW's Options File Editor Viewer in both of the Map Tabs you can enable each of the contacts sensors in turn and see how they work in your game.
I took out the BB in Norway medium fog outside when coming up from this depth and they never knew I was there.
I went down to 134 metres with 9 DD's trying to find me and even passing over and not depth charging.
All the depth charging, plenty of it, was random.
I sneaked away at 1 knot at this depth changing course every 15 minutes.
Realism > High 82%
Peter
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