Question

who was the first man to climb out mount everest without oxygen​

Answer 1

Answer:

Messner and Habeler

Messner and HabelerSometime between 1 and 2 in the afternoon on May 8, 1978, Messner and Habeler achieved what was believed to be impossible—the first ascent of Mt. Everest without oxygen.

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Answer 2

Answer:

Reinhold Messner and Peter Habeler

On 8 May 1978, Reinhold Messner and Peter Habeler reached the summit of Mount Everest; the first men known to climb it without the use of supplemental oxygen. Two years later, on 20 August 1980, Messner again stood atop the highest mountain in the world, without supplementary oxygen .