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The original was posted on /r/explainlikeimfive by /u/Golden_showers on 2023-06-27 10:07:32+00:00.

Original Title: Eli5. Why does the compression change in breathing compressed air at different depths? Surely the ‘oxy-mix’ metal container doesn’t physically ‘compress’ any further than it has in 1atm (unless at near Hadal Depths)

Im obviously confused somewhere. But let me explain further.

You have a metal container, carrying your breathable gas mix (depending on your depth). If this container doesn’t actually physically compress further due to the rigidity of the metal, then why would breathing a 80-20 mix of Ni and O in a compressed container cause any effects?