How Climbers Sleep in Everest's Death Zone

At 26,000 feet on Mount Everest, nobody really sleeps. Climbers reach Camp Four on the South Col around midday, lie in their tents on bottled oxygen, melt snow for hours, and set off for the summit at nine o'clock at night. We spend one night at Camp Four: why the air holds only about a third of the oxygen your body is used to, what blood tests taken near the summit revealed, why your breathing stops and starts while you doze, why climbers leave in the dark, and the storm of May 10, 1996, when climbers were lost on the col just a few hundred yards from their tents. Next: the crab boats of the Bering Sea. Chapters 0:00 8 p.m. on the South Col 1:49 The saddle 3:56 A third of the air 6:08 Water from snow 8:02 Lying awake 10:06 The nine o'clock alarm 12:13 The storm of May 1996 15:49 First light on the ridge Sources South Col elevation and history; 1996 Mount Everest disaster timeline (Wikipedia, Britannica, HISTORY) "Death zone" term: Edouard Wyss-Dunant, 1953 (Lankford, Wilderness & Environmental Medicine, 2021) Air pressure on Everest and the South Col: West, Journal of Applied Physiology (1999) Arterial blood gases at 8,400 m: Grocott et al., New England Journal of Medicine (2009), Caudwell Xtreme Everest Periodic breathing at altitude: Journal of Physiology review (2024) and studies of climbers at Everest North Base Camp Operation Everest III weight loss: Journal of Applied Physiology (1999) 2019 South Col weather stations: Bulletin of the American Meteorological Society (2020), National Geographic 2024 cleanup (11 tons removed, 40 to 50 tons estimated on the South Col): NPR, The Himalayan Times Waste-bag rule (2024) and permit fee (2025): Washington Post, Kathmandu Post Oxygen use and summit-night timing: Alan Arnette, mounteverest.net Image and video credits Photos via Wikimedia Commons. CC BY-SA 4.0: AngeliSherpa, Gerd Eichmann, Daniel Oberhaus, Goutam1962, Bijay Chaurasia, Catalina Quesada Castro, Chic500, ChrisJones11332, Debasish Biswas Kolkata (retouch by MagentaGreen), DTKMAG, Heaven Himalaya, Iamsk21, Iamthanes, Jaan Künnap, Jayeverest, Kanchhi Dolma Hyolmo, Kjoisher, Marickew, Nepal Trek Adventures, Nir B. Gurung, Nirajha, Nirav.pradhan, NLTT Shiva Paudel, Samuel Saidel Goley, Sauravmallathakuri, Thaneswar Guragai, Thisisbadri, Uta, VaporInTheWind, Vlvescovo, 8848hehe, Assistantto, Салтанат Асхарова, 김홍빈. CC BY-SA 3.0: Uwe Gille, Tirthakanji, Sanjay Kodain Mountaineer, Igomezc, James Heilman, Matt Wier, Michelle Welsch, Sandra Leduc, Superikonoskop, Thomas Fuhrmann, and an unnamed Commons contributor. CC BY 4.0: Vyacheslav Argenberg. CC BY 3.0: Tom Frost. CC BY 2.0: McKay Savage, Moving Mountains Trust, Sebastian Werner, Nenad Stojković (Shixart1985). Public domain: Fmd953. Video: Alan Arnette and Panuru Sherpa (CC BY 3.0), Yandak (CC BY-SA 4.0), Portraits du Monde (CC BY 3.0), via Wikimedia Commons; stock footage from Pixabay. Thumbnail photos: AngeliSherpa, Tirthakanji, Sanjay Kodain Mountaineer (CC BY-SA). Full list with titles and links in the pinned comment. A few illustrative scenes (the blizzard, the headlamp line, the frozen trash) are AI-generated. Narration voice: AI-generated. #Everest #mountaineering #deathzone