On May 8, 1978, Peter Habeler and Reinhold Messner achieved a feat of human endurance unparalleled in they climbed to the summit of Mount Everest without the use of artificial oxygen. The story of their success, achieved in the face of almost unanimous medical and mountaineering opinion that to climb Everest without oxygen was to accept irreparable brain damage and perhaps death, is a breath-taking tale of adventure and willpower, in its own way as remarkable as Hillary's initial conquest of Everest.