I have been in one of these chambers - first for a “dry dive” with my dive club to find out what it was like, and then for real after coming up faster than would be ideal (conscious decision, I’m an instructor and my novice buddy had disappeared to the surface - both of us ended up fine).
While there ( https://www.ddrc.org/ ) I did see some scientific posters they had on diabetic wounds that had healed with this treatment that hadn’t responded to anything else (next step would have been amputation). For some of my treatments there were 10 of us in the chamber, I can’t remember all the details but at least one had a broken leg. So there clearly are things it can help with.
In these cases the explanation was that by saturating the blood plasma with dissolved oxygen, you can get extra oxygen supplies to damaged tissue that wasn’t otherwise getting enough to repair itself.
They are (and have to be) very careful about fires - so you change into cotton scrubs provided by them, you can’t wear deodorant, and the main atmosphere is air - you either breath in the pure oxygen from a regulator or a hood that’s placed over your head. Their “headphones” are long air tubes with the speakers outside. (Typically you watch a film in the treatment to pass the time. I think I pissed them off bringing them in on Sunday evening, so we got bride wars then Bambi)
If you are a diver, once we get back to normal see if your local chamber will offer a “dry dive”. It was really interesting, and it meant I felt a lot less nervous when I needed to go in the chamber for real.
