team-tree-syndicate t1_j1bypur wrote on December 23, 2022 at 4:12 AM

As long as your body intakes normal air, and the atmosphere outside is the same pressure as our atmosphere, then I would think that nothing of significance would happen. Being submerged in water and having a breathing apparatus, but not a full diving suit is possible already, so long as the pressure differential isn't significant. Breathing pressurized air deep underwater and then rising up too quick is dangerous due to gas expansion, as well as nitrogen saturation. As for long term side effects, I don't believe it has been tested before in a study. Could be wrong on this though.

curt15-club t1_j1dq477 wrote on December 23, 2022 at 3:31 PM

Yup, for anyone interested, many SCUBA divers use wetsuits which trap a layer of water inside that your body heats up to keep you warm even in somewhat cold waters. Drysuits keep the water out but are less comfy and are for more extreme cold temps, usually < 50°F (you get cold faster in water so even 50° is dangerous if unprepared)