I regret not getting clearer pictures to zoom in and see the words on the instruments but I felt the need to be discreet as I was just walking by, these ocean-front home garages are rarely/NEVER left open unattended. What is this mystery chamber?
One more different angle picture in the comments, you can see the seating bench in the chamber.
Some people also just use them for purposes that are less clinical. Hyperbaric chambers back in the day were one of those cure-alls that were and are purported to treat all sorts of ailments, increase mental performance, sense of wellbeing, etc. I imagine it's a mix of real uses and bogus uses, but billionaires love to splurge on that kind of thing.