Quote:
"Despite queries, at Horst Bredow [owner of the well known U-boat Archive] and old U-boat sailors, no one could tell me how many compressed air-bottles and how many oxygen-bottles the boats had on board. Therefore I do not know also for how long the oxygen-supplies were enough. From my own experience I can say, that the batteries became empty with extended underwater-patrol and we had to surface. That the oxygen from the bottles came to an end, I have not experienced."
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Again very interesting and authentic reply

To better put it into its proper historical frame, can we know in which period Mr. Paas served?
I suspect that early to mid war crews didn't suffer the limitations that late war crews suffered when it comes to endurance underwater. The logic says that if Mr. Paas is still alive, he will probably have served in late war, but knowing it can help us clarify better the whole thing.