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In mountaineering, the death zone refers to altitudes above which the pressure of oxygen is insufficient to sustain human life for an extended time span. This point is generally agreed as 8,000 m (26,000 ft), where atmospheric pressure is less than 356 millibars (10.5 inHg; 5.16 psi). [ 1 ]
In the death zone, the human body cannot acclimatize. An extended stay in the death zone without supplementary oxygen will result in deterioration of bodily functions, loss of consciousness, and, ultimately, death. [3] [4] [5] The summit of K2, the second highest mountain on Earth, is in the death zone.
The mountain was first climbed on October 19, 1954, via the north-west ridge by Herbert Tichy, Joseph Jöchler and Sherpa Pasang Dawa Lama of an Austrian expedition. [10] Cho Oyu was the fifth eight-thousander to be climbed, after Annapurna in June 1950, Mount Everest in May 1953, Nanga Parbat in July 1953 and K2 in July 1954.
Over 81 million people live permanently at high altitudes (>2,500 m or 8,200 ft) [52] in North, Central and South America, East Africa, and Asia, and have flourished for millennia in the exceptionally high mountains, without any apparent complications. [53] For average human populations, a brief stay at these places can risk mountain sickness. [54]
While the rest of the human population would suffer serious health consequences at high altitudes, the indigenous inhabitants of these regions thrive in the highest parts of the world. These humans have undergone extensive physiological and genetic changes, particularly in the regulatory systems of oxygen respiration and blood circulation when ...
Chimborazo is only the 39 th tallest mountain in the Andes, when measured from sea level, but there was a brief time in the 19 th century when it was thought to be the world’s highest peak.
On July 18, 2023, Hugo Ayaviri climbed Gasherbrum II without oxygen, the fourth 8000’er in his quest to be the first Bolivian to summit all fourteen 8000m peaks. [35] On July 19, 2023, Andrzej Bargiel made the highest descent from Gasherbrum II on skis. He summitted the mountain without the use of supplementary oxygen and began his ski ...
Two years later, on 20 August 1980, Messner again stood atop the highest mountain in the world, without supplementary oxygen. For this solo climb, he chose the northeast ridge to the summit, where he crossed above the North Col in the North Face to the Norton Couloir and became the first man to climb through this steep gorge to the summit ...