I think the SH3 off-watch crews probably stoke-up when not in view of an officer...smoking on u-boots was usually only possible when surfaced (and circulating fresh air) or while under snorkel due to the carbon-monoxide that it naturally expends.
The CO2 filters would be under a lot of additional stress while submerged...
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OLt.z.S.Benetschik (Benetofski)
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\"U-bootwaffe - eine Gemeinschaft zusammengebracht durch Schicksal\"
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