Aren't there only a dozen or so mountains above 8000 m? Can you really do that without supplementary oxygen? Amazing.
14 of them. The first person to climb them all did so without supplemental oxygen.
https://en.wikipedia.org/wiki/Reinhold_Messner
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14 of them. The first person to climb them all did so without supplemental oxygen.
https://en.wikipedia.org/wiki/Reinhold_Messner