A British physician, Nahaniel Henshaw, proposed what might have been the primary hyperbaric chamber for medical treatment of humans in 1662. The metal container was to have been pressurised with air, which at some time wasn't still recognised to have oxygen, later found out by Carl Wilhelm Scheele all over https://zandericwja.bleepblogs.com/36874538/indicators-on-oxygen-chambers-for-healing-you-should-know