Jon Griffith and Sherpa Tenji attempted to finish off their belated friend, world-famous climber Ueli's project – climbing both Mount Everest and Mount Lhotse without the use of bottled oxygen. Join them to witness what it’s like to be engulfed in a Himalayan avalanche, cross a crevasse and stare deep in its depths, be caught out in a storm, and take in the view from the top of the world. 

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