Even today, American submarines have fires all the time. I can't name any names, but I know for a fact that on certain attack submarines fires have gotten so bad the boat has had to surface on tour (a big uh-uh in nuclear submarines). German Uboots had fire problems for sure, and fire problems in any submarine are an embarrassment to the navy to which it happens. Thus I suspect the lack of proof of Uboot fires has far more to do with German classification and document destruction for propaganda purposes than magical German anti-fire engineering.
The two greatest enemies of submariners have always been fire and water. If either is in the compartments, the ship is only so far from becoming a casket.
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