I agree with rockin responding to the posts why I die with one hit or no hits and not at crush depth. Remember any engagement might produce hull damage you are completely unaware of. A depth excursion of only 1 ft below what your damaged sub can take will do you in. Those of you blowing ballast to save your boat- you know you can do that more than once right? With good crew and damage management, you can often buy yourself enough time to at least hold a shallow depth until it's safe to come up and run for port.
-Pv-
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