@JayDee:
That is extremely valuable information, JayDee, and the U-boatArchive.net references are clearly to near-contemporary (1946) American reports taken from seized German documents.
This information must be much more accurate than that remembered by survivors after the passage of 60 years.
Eg, for the Type IX boats, "For oxygen renewal a total of 13 flasks, each containing 50 liters of oxygen under 160 atmospheres (2275 p.s.i.) pressure, are installed. 44 sets of emergency breathing apparatus are carried on board."
Well done!
Stiebler.
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