ASW action in that case is very possible. Im no great naval expert, but i beleive thermal layers are typically DEEPER in colder water, which made them something uboats didn't enjoy very often. Since the Kiska is much colder, a thermal layer was probably out of the boats reach. If heavy ASW was present, then all we can do is guess. Maybe the skipper just took her too deep? Then again, would a deep charge cause a genuine implosion, or just split the pressure hull open and flood the boat? Did she take on too much water and get too heavy during a depth charge attack and just.. sink? Did the main induction valve bust open for one reason or another? (that would sink a boat VERY quickly) I guess the answer is when the examine the hull more throughly.
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