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.
They are very dangerous to operate. You're working with 100 percent O2 under pressure, so even little things like lotions/ perfumes that use a thinning product can cause combustion.
As far as enforcement.... There are only a couple different companies capable of making a chamber that can withstand 6 atmospheres of pressure safely, and they're all governed by CMS like other pieces of heavy duty medical equipment.
There's a lot of licensing and overwatch for medical equipment like this, if a company were to actually make one without going through the proper channels the companies and licensing orgs that have done their due diligence would come after them.