Asdic could not operate in bad weather or penetrate thermal layers in reality. It does, however, depend on the amount of noise you could be making, were you on silent running? Loading torps is bad for your health, its really quite a noisy process involving chains.
In bad weather, eg: Atlantic, in WW2, sub hunters like Capt Walker RN, could not use Asdic in heavy swell. (and he was a real expert).
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Captain!, there's a destroyer on the por........ periscope is flooded Sir!
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