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foxyv 2 days ago

At very high pressures, helium is actually the opposite of a narcotic. This is why it is introduced in Trimix for deep dives. It kind of offsets the narcotic effect of the high pressure oxygen. However it can also cause trembling if there is too much of it.

https://pmc.ncbi.nlm.nih.gov/articles/PMC7478267/

To offset this problem, world record divers are introducing Hydrogen to their mixtures at extreme depths.

https://en.wikipedia.org/wiki/Hydrox_(breathing_gas)