https://www.milsurps.com/images/impo...w330h432-1.jpg
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Judging by the sign and the canisters by the GI's feet do not think it is a health spa behind those doors :(
Lebensgefahr means "Danger to life"...the rest I really can't make out. Where's Patrick Chadwick when you need him?? He'll read all that.
A few more translations and background are on THIS page.
Bob