First ascent of Everest without supplementary oxygen

According to Official Guinness Records,

Reinhold Messner (Italy) and Peter Habeler (Austria) made the first successful ascent of Mt Everest without supplemental oxygen on 8 May 1978. This feat is regarded by some purist mountaineers as the first 'true' ascent of Everest, since overcoming the effects of altitude (i.e. the low oxygen content of the air) is the greatest challenge facing high-altitude climbers.

For a complete list of 1978 records, please visit 1978 Guinness Records in Nepal.

Related Images

Other Nepal records that might interest you:

• First ascent of Dhaulagiri I
• Largest clear-up on Everest
• First ascent of Everest (female)
• Highest marathon
• Highest mountain
• Most siblings climbing together an 8,000-m mountain