Undersea and hyperbaric medicine deals with the prevention of injury and illness due to exposure to environments in which the ambient pressure is increased, such as in diving or hyperbaric chamber exposure, and the therapeutic use of high environmental pressure and the delivery of oxygen under high pressure to treat disease.

The scope of the subspecialty emphasizes the occupational, environmental, safety, and clinical aspects of diving, hyperbaric chamber operations, compressed air work, and hyperbaric oxygen therapy. Undersea and Hyperbaric Medicine involves the prevention of injury and illness from exposure to environments with increased ambient pressure (such as in diving or hyperbaric chamber exposure), and the therapeutic use of high-environmental pressure and the delivery of oxygen under high pressure to treat disease. The scope of the subspecialty emphasizes the occupational, environmental, safety, and clinical aspects of diving, hyperbaric chamber operations, compressed air work, and hyperbaric oxygen therapy.