i'm sure they touch on this in Das Boot too (the book) about the fact that they didn't open a valve so kept flooding the tanks and whatnot thinking they weren't leaving the surface?
as for crush depths i've never been deep enough to get smushed except once when i flooded heavily and ended up on the bottom trying to repair frantically.
3 blows of compressed air later and alot of pumping and we slowly started to rise again.
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