If you attempt to climb Everest, you have to use bottled oxygen. This is because the higher the mountain gets , the lower the oxygen level. It is possible for you to climb Everest without using oxygen, but you would be at a higher risk of getting seriously injured or killed. Bottled oxygen was first used by George Finch and Geoffry Bruce in 1922. The two men climbed to 26,500 feet. However, Reinhold Messer and Peter Habeler made the first successful climb without bottled oxygen in 1978.
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