KnowraSupplemental oxygen in mountaineeringLinked fromLinked fromThe 6 pages that link to Supplemental oxygen in mountaineering, each with the reason it gives.All 6Related 4Compared with 2Reinhold MessnerCompared with: Messner’s oxygen-free ascents challenged a long-standing aid for climbing above 8,000 meters.Broad PeakCompared with: The 1957 first ascent was achieved without supplemental oxygen, unlike many later expeditions.