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I would recommend this well written article: https://www.outsideonline.com/1922711/raising-dead

It's the story about the diver David Shaw and his attempt to recover the body of diver Deon Dreyer in one of the deepest sweetwater caves on earth. A bit of a read but well worth it.

This is not cave diving, though. It's a very deep sinkhole, but with a clear path to the surface. The risks in these dives are related to extreme depth, not to the overhead environment.

That said, it's a terrific article.

This American Life had an episode on this called No Man Left Behind :


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