What is the world record time for ascending both Mt. Everest and K2 without supplementary oxygen?
Answer 63 days
Climbing either Mt. Everest or K2 without supplementary oxygen is a feat in itself, but Italian mountaineer Karl Unterkircher did both of them back-to-back. He set the record in 2004 by reaching the summit of K2 on his 63rd day.
Asked by Don Ayres · Last updated 5 years ago · 1.1K views · SOURCE
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