The summit of Mount Everest is in the<unk> . In mountaineering, the<unk>  refers to altitudes above a certain point where the pressure of oxygen is insufficient to sustain human life for an extended time span. This point is generally tagged as , less than 356 millibars of atmospheric pressure). The concept was conceived in 1953 by Edouard Wyss-Dunant, a Swiss doctor, who called it the lethal<unk> . All 14 peaks above 8000 m in the<unk>  are located in the Himalaya and Karakoram of Asia. Many<unk> s in high-altitude mountaineering have been caused by the effects of the<unk> , either directly by loss of vital functions or indirectly by wrong decisions made under stress, or physical weakening leading to accidents. An extended stay above without supplementary oxygen will result in deterioration of bodily functions and<unk> .
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Trigger zone
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Penumbra 
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