A subspecialty certification by the Board of Preventive Medicine. Practitioners treat decompression illness and diving accident cases. They use hyperbaric (high pressure) oxygen therapy to treat such conditions as carbon monoxide poisoning, gas gangrene, non-healing wounds, tissue damage from radiation and burns, and bone infections. These specialists also provide consultation to other doctors in all aspects of hyperbaric chamber operations. They assess risks and take measures to prevent disease and disability in divers and other people working in altered atmospheric conditions.