WWII submarine batteries were of the "lead -acid" type I think. In normal operation (as power sources) there is no hydrogen issue,
BUT
in re-charging mode ,if the voltage applied is not properly controlled, it may function as an electrolytic cell (water electrolysis) and produce hydrogen.
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- Oh God! They're all over the place! CRASH DIVE!!!
- Ehm... we can't honey. We're in the car right now.
- What?... er right... Doesn't matter! We'll give it a try anyway!
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