Another thing I just came up with: as part of the sub's damage model you should have the option to give the order to test the state of the pressure hull. I read somewhere in a u boat diary that the kaleun gave the order to find out whether the pressure hull was intact by inflating air in the room (if i remember correctly).
I must say that's a new one on me
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Wise men speak because they have something to say; Fools because they have to say something. Oh my God, not again!!