A British doctor, Nahaniel Henshaw, proposed what would have been the 1st hyperbaric chamber for health care treatment of human beings in 1662. The metal container was to are pressurised with air, which at time wasn't however acknowledged to have oxygen, afterwards discovered by Carl Wilhelm Scheele about 1770 and https://oxygen-chambers08417.mpeblog.com/64152304/oxygen-chambers-for-healing-for-dummies