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On 8 May 1978, Reinhold Messner and Peter Habeler made the first ascent of Mount Everest without supplemental oxygen. [40] Messner had ascended all 14 "eight-thousanders" without supplemental oxygen by 1986. Running out of bottled oxygen was noted as a factor in the 1979 deaths of Ray Genet and Hannelore Schmatz on Mount Everest. [41]
Bottled oxygen can help mountaineers survive in the death zone. Mountaineers use supplemental oxygen in the death zone to reduce deleterious effects. An open-circuit oxygen apparatus was first tested on the 1922 and 1924 British Mount Everest expeditions; the bottled oxygen taken in 1921 was not used (see George Finch and Noel Odell).
[72] [73] The oxygen cylinder's shape, size, valve assembly, and stamp, no 9, E.O.C. (Everest Oxygen Cylinder), conclusively confirmed that the bottle had belonged to the 1924 British Mount Everest expedition and had been used by Mallory and Irvine, as they were the only party who had used oxygen for a summit attempt. [73]
The lack of oxygen poses one of greatest threats to climbers who attempt to summit, with levels dropping to less than 40% when they reach the Everest “death zone.”
The 1996 Mount Everest disaster occurred on 10–11 May 1996 when eight climbers caught in a blizzard died on Mount Everest while attempting to descend from the summit. Over the entire season, 12 people died trying to reach the summit, making it the deadliest season on Mount Everest at the time and the third deadliest to date after the 23 fatalities resulting from avalanches caused by the ...
He’s acclimatizing, in the bedroom of his second home near Lake Tahoe, for an attempt to climb Mt. Everest in May. Graham Cooper uses a pulse oximeter to check his blood oxygen levels and pulse ...
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