[scirpaceus]

> It's thought that you can avoid this by subbing out the helium for hydrogen, but nobody so far has been insane enough to try.

It's reportedly been done very recently using a rebreather (https://gue.com/blog/n1-the-inside-story-of-the-first-ever-h...).

Prior to that, in 1992, there was the French COMEX-sponsored HYDRA 10 experiment that saw Théo Mavrostomos dry-dive in a chamber to 701 meters (71.1 bars) - the world's absolute saturation dive depth record. Though that experiment used "only" 20% H2 (https://www.newscientist.com/article/mg13618493-000-technolo...).

[extraduder_ire]

Reading that first article freaked the hell out of me, thanks.

Glad there's some people out there nuts enough to push the limits of this stuff. No idea why those people in new zealand don't use pressure suits to dive in that hole though.