I want to try this too. Pero parang nakakaclaustrophobic inside the chamber.
Alam ko meron 1k+ not sure lang how long. And dapat walang sipon kasi air pressure ito so masakit sa sinuses if swollen. It's also done to/used by Divers kasi yata if they have accidents delikado sa brain, since their under the sea and water pressure.
Oxygen cures alot of illnesses kasi. Our atmosphere pretty much has less oxygen and more pollution.