The Crystal Horizon Everest-the First Solo Ascent
Who is Andrew Irvine from The Crystal Horizon Everest-the First Solo Ascent and what is their importance?

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Andrew Irvine is the climber who accompanied Mallory on the ill-fated assault of Everest's second step in 1924. Irvine was an expert in the use of artificial oxygen, which the two opted to use during their ascent, based on a unanimous vote of the entire party before the pair began their climb.