In January 2018, Sadpara joined Basque mountaineer Alex Txikon [es],[12] in an unsuccessful attempt on Mount Everest during winter without supplemental oxygen.

[10][13][14] In June 2018, he joined French speed climber Marc Batard [fr][15] to undertake a five-year program known as "Beyond Mount Everest".

Sajid was later forced to descend due to an oxygen regulator malfunction,[19] leaving the other members of the team at the K2 Bottleneck, close to the summit.

Sadpara, Sigurjónsson, and Prieto continued their ascent to K2's summit, but did not return by night as planned, and were declared missing on 5 February 2021.

[22][23][24] On 18 February 2021, Pakistani authorities announced that the three men were officially presumed dead, but the search for their remains would continue.