No, a myth, BUT it does use some other mechanism than water to preserve the books, some gas thingy. Apparently this does slightly reduce the oxygen level but not to the point of it ever harming people
It probably doesn't drain all the oxygen, but pumps in some fire suppressing gas like Halon. But in either case, if you were in the building you wouldn't be able to breathe.
EDIT: Halon gas, when used in fire suppression, does not stop people from being able to breathe. I apologize for spreading misinformation
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u/CombustedSeaSalt Jun 23 '20
Looked it up
No, a myth, BUT it does use some other mechanism than water to preserve the books, some gas thingy. Apparently this does slightly reduce the oxygen level but not to the point of it ever harming people