Carl Edmonds, formerly OIC of the Royal Australian Navy Diving Medical Unit, Foundation President of the South Pacific Underwater Medical Society and Director of the Australian Diving Medical Centre, Sydney, Australia Michael Bennett, conjoint associate professor in anaesthesia and diving and hyperbaric medicine, University of New South Wales, Sydney, Australia John Lippmann, founder, chairman and director of research, DAN (Divers Alert Network) Asia-Pacific, Ashburton, Australia Simon J. Mitchell, head, Department of Anaesthesiology, University of Auckland, New Zealand; and consultant in diving and hyperbaric medicine, Slark Hyperbaric Unit, North Shore Hospital, Auckland, New Zealand