Climbing some of the world’s tallest mountains, you enter the “death zone” when you are 8,000 metres from sea level – where oxygen is 34% the concentration it is on the ground below. Climbing here is one of the most dangerous forms of tourism there is. For mountaineers, the most tantalising goal is to climb the world’s 14 highest peaks, all of which stretch into the death zone.
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Climbing Everest is the Greatest Challenge a Person Can Attempt
For mountaineers, the real goal is to climb the world’s 14 highest peaks, all of which lie in the death zone.

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