this post was submitted on 26 Jan 2024
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And the reason that works is that your body doesn't actually detect low oxygen. When you hold your breath for a long time, the sensation comes from high CO2 levels. That's one reason that working in a hydrogen or helium airship is dangerous, because there can be a leak and you won't even notice until passing out.
Shout out to Project Hail Mary for educating millions about this.