Quote:
Originally Posted by Stiebler
The U-boats were to come to the surface only once at night, for long enough to recharge their batteries (2-4 hours). NOT to recharge their air – I checked this with real U-boat survivors.
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As far as I know, the pressure air on a submarine was only used for "work purpose" (blow ballast tanks, operate air driven equipment like compressed air engines, and so on). I never heard that compressed air was used to renew the breathable air inside the boat. For this purpose, the sub is equipped with compressed oxygen that can't be refilled at sea.