Hyperbaric oxygen therapy (HBOT) is a treatment used to breathe pure oxygen in a pressurized chamber. This therapy is well-established and used to treat decompression sickness, which is a risk when scuba diving. Other conditions that can be treated with HBOT include diabetes, radiation injury, and serious infections.
In the chamber, the air pressure is increased two to three times what is normal. With this increase, your lungs are able to gather more oxygen than if you were just breathing pure oxygen at normal air pressure.