I remember reading long time ago that compressed O2 was released inside the sub while being forced to be submerged a long time. It was painful to the crew because the atmospheric pressure increased inside the sub.
I think WWII subs didn't have the technology to exhaust air while submerged.
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It was a dark and stormy night...
From the 1830 novel, 'Paul Clifford' by Edward George Bulwer-Lytton
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