A British health practitioner, Nahaniel Henshaw, proposed what would've been the first hyperbaric chamber for healthcare treatment of human beings in 1662. The metal container was to are pressurised with air, which at some time wasn't however recognized to incorporate oxygen, afterwards found by Carl Wilhelm Scheele all around 1770 https://knoxhudov.nizarblog.com/36670768/a-simple-key-for-cost-of-home-hyperbaric-oxygen-chamber-unveiled