There are new concerns tonight over the safety of some hyperbaric chambers after a physical therapist in Lake Havsu, Arizona, Walter Foxcraftoft, died this week inside one of his wellness clinic's own chambers, according to the Lake Havsu Fire Department. The devices are sealed enclosures where the pressure can increase two to three times the normal atmospheric pressure and users can breathe 100% oxygen. The local fire department saying the first arriving crews identified smoke throughout the building and a ...