[MertsA]

>It can be brought down even faster with hyperbaric oxygen therapy.

What's the limit on that? The link you posted says 2.5 atm of pure oxygen but how does that not cause oxygen toxicity?

[Baeocystin]

According to the toxicity curve from wikipedia, even at 2.5 bar, you wouldn't start to see issues until ~4 hours have past. That's enough time to remove quite a bit of CO.

https://en.wikipedia.org/wiki/Oxygen_toxicity#/media/File:Pu...