[nojvek]

Holy moly. The human diving at 332 meters is insane. That’s 34 ata, or 34 times the atmospheric pressure, or 34x compression on your body. Did they use some sort of inverse pressurized suit that can hold this sort of pressure ? I’ve scuba dived to 50m and even that was a bit dizzy for the brain. People have known to hallucinate if they stay deep too long. 330+ meters is absolute nuts. Wow! Someone explain me the science of how this is possible.

[McDyver]

Very broadly, when scuba diving you're breathing gas at the same pressure of the depth at which you are. So the deeper you go, the greater the pressure of the gas that is being dissolved into your tissues. You don't feel this pressure, only the pressure in the body's "hollow" spaces, like sinuses, Eustachian tubes. That's why you need to equalise on the way down.

When you dive to 50m, the feeling of "being dizzy" happens when diving on air. This is due to Nitrogen narcosis. To minimise this, in technical diving, helium is added to the mix, to reduce the percentage of nitrogen and minimise the narcosis.

Going down to 332m, as you correctly say subjects you to a pressure of 34 Bar. To dive this deep you need to be breathing 4% Oxygen, maximum (compared to 21% that is in air we breathe at the surface). At this level, making the mix needs to be extremely precise and you need to be sure your instruments are properly calibrated, as a 5% mix can potentially kill you at that depth.

[dahdum]

Your body is primarily water so no pressure suit is necessary, but gas narcosis, high pressure neurological syndrome, and oxygen toxicity are all serious issues. You use different breathing mixtures like trimix or heliox to manage them.

Ascending is just as dangerous since you now have highly compressed gas bubbles throughout your body. There are different models you can follow to manage decompression, but it’s far from settled science. Both individual variation and situational factors can affect it greatly.