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ws2500 Everest INTV _00040622
ws2500 Everest INTV _00040622

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    Conquering Everest without supplemental oxygen

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Conquering Everest without supplemental oxygen

Cory Richards and Adrian Ballinger tell CNN World Sport's Patrick Snell why they took on one of the world's riskiest challenges.

Conquering Everest without supplemental oxygen

Cory Richards and Adrian Ballinger tell CNN World Sport's Patrick Snell why they took on one of the world's riskiest challenges.