Hello, I'm an expert in mountaineering and high altitude physiology. When discussing the "Death Zone," we're typically referring to altitudes on mountains where the human body can't acclimatize to the lack of oxygen and every moment spent there is a struggle for survival.

The Death Zone generally starts at 海拔8,000米 (about 26,000 feet) on Mount Everest and similar high-altitude peaks. Above this altitude, the air is so thin that the body can't get enough oxygen, even with supplemental oxygen, to maintain normal functions without significant risk. This is why climbers ascending to the summit of Everest and other 8,000-meter peaks often race against time to reach the top and return as quickly as possible.

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The death zone is the name used by mountain climbers for high altitude where there is not enough oxygen for humans to breathe. This is usually above 8,000 metres (26,247 feet). Most of the 200+ climbers who have died on Mount Everest have died in the death zone.read more >>