Yes, both Nepali-Indian mountaineer Tenzing Norgay and Edmund Hillary of New Zealand used supplemental oxygen when they made the first successful attempt to reach the summit of Mount Everest. The area above 8,000 meters (26,250 feet) on Everest is called the “Death Zone.” This is because the air is thinner, meaning that the concentration of oxygen is lower. An inadequate oxygen supply, known as hypoxia, can cause confusion, lack of muscle coordination, and death. Most climbers who summit Everest use supplemental oxygen.
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