Well, I think what he must be speaking of is, submerging below PS depth with them still raised and above a certain speed. For example: in modern subs, submerging with the radar mast raised will damage it at a low speed, the scope at yet a higher speed.
But to answer the question, I don't believe the WWII subs were capable of enough underwater speed to do damage. Anyway, I ASSUME this is correctly modeled in game.
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RVAH-9 RA-5C Vigilante at NAS Sanford, Fl 1966
The coolest plane few have heard of!
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