Three days after scripting history with the first winter ascent of Mt K2, the world’s second-highest mountain, Nirmal “Nims” Purja, one of the 10 Nepali summiteers, has announced that he climbed without using supplemental oxygen.

Purja’s announcement came through his website although the team had earlier planned to announce the feat in Islamabad, Pakistan later this week.

“It was a tough call this time in order to make that decision whether to climb with or without supplemental oxygen (O2). Due to the weather conditions and time frame, I hadn’t acclimatised adequately. I was only able to sleep as high as Camp 2 (6,600m). Ideally, climbers need to sleep OR [sic] at least touch Camp 4 before heading for a summit push. Lack of acclimatisation, developed frostbite from the first rotation and slowing down other team members, risking everyone’s safety, were the key uncertainties associated,” Purja wrote on Monday.

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