I may be wrong, but I remember reading somewhere, some time ago, that submarines getting their skin pressed in, showing the ribs etc as bumps on the surface was more of an issue with WW2 American subs, than with German. I'm not sure why, different construction? Different operating depths? Anyway, I remember seeing many pictures of Gato class subs with this skin thing, but I don't recall having actually seen a single one of a German type VII.
Is it just me remembering wrong, or is there something to this?
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