I'd hesitate to ease to ease the risk of asdic detection, as in some ways this compels more realistic behaviour. For a start maintaining PD was not always easy, and so keeping to PD in daylight when hunted was a tactic with it's own risks. Firstly that part of the boat my accidently broach and be spotted, after which it was in for a very rough time, or, the much faster manoeuvering destroyers presented a risk of being rammed.
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