On 5 February 2021, three mountaineers went missing while attempting to summit K2 without supplementary oxygen, braving extreme winter conditions.

The group included seasoned climbers: Ali Sadpara, a veteran mountaineer; his 21-year-old son, Sajid Sadpara; Icelandic mountaineer John Snorri Sigurjónsson; and Chilean climber Juan Pablo Mohr Prieto.

[8][9] On 5 February 2021, when the group reached the Bottleneck, a particularly technical part of the climb, Sajid Sadpara started feeling altitude sickness.

Sajid Sadpara waited hours at Camp 3, but when they did not return at the scheduled time, he started preparing for the worst.

Commenting on the death of his father and his mountaineering companions, Sajid Sadpara said:He set many records including the winter ascent of Nanga Parbat in 2016 and earned immense respect and praise from the best climbers in the world.