A British health practitioner, Nahaniel Henshaw, proposed what would've been the 1st hyperbaric chamber for health care treatment of people in 1662. The metal container was to are actually pressurised with air, which at time wasn't nevertheless identified to contain oxygen, later on uncovered by Carl Wilhelm Scheele all-around 1770 https://oxygen-chamber-therapy-co18405.bloguetechno.com/about-oxygen-chambers-71546980