Humans cannot survive for more than 48 hours in the death zone, where oxygen levels are dangerously low. Retrieving the bodies of fallen climbers is also extremely difficult, because helicopters aren't able to land at this altitude. However, Sherpas have mounted perilous expeditions to bring bodies back down the mountain.
The Dangers Of Mt. Everest's "Death Zone"
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Key Facts In This Video
At the summit of Mt. Everest, there's only one third the amount of oxygen that there is at sea level. 01:09
At Mt. Everest's Camp 3, just below the death zone, Dr. Ken Kamler's tent was sitting at a 45-degree angle, and all of his syringes were frozen. 10:27
In 1996, a helicopter pilot risked his life to fly more than 6,000 meters up Mt. Everest and perform one of the highest rescue missions in history. 18:54