Here's my impression: I started in '43 with a Gar class and green crew and diving seemed to take at least 60 seconds. Now, at the end of '43 I've got a Balao class sub and the lowest rank on board is Petty Officer 3rd class and now the sub dives in about 45 seconds.
So I assume that the rank and experience of the crew influences the dive times. Can anybody confirm?
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