Thanks a lot for the information, Stiebler!
Do you know how long it took until they surfaced because of the batteries and at what speed they usually travelled submerged? From what I gathered elsewhere battery lifetimes varied a lot depending on age, speed (obviously),...
In addition, I don't think that they surfaced when the batteries were already almost empty. I guess they always wanted to keep some reserves in order to have enough power to escape in case of being attacked.
Regards, LGN1
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