A small team consisting of Tasker, Boardman, and Doug Scott made an ascent of Kangchenjunga (at 8,598 m the third highest mountain in the world) by a new route from the North-West in 1979 (with Georges Bettembourg also on the team but not making the summit); this was also the first ascent of the mountain without the use of supplementary oxygen. A second attempt on K2 in 1980 saw Tasker almost wiped out by an avalanche and was ultimately unsuccessful. In the winter of 1980-1981 Tasker was part of an eight-man team (with Alan Rouse, John Porter, Brian Hall, Adrian Burgess, Alan Burgess, Pete Thexton and Paul Nunn) attempting to make a difficult winter assault on the West Face of Mount Everest; this was unsuccessful but was recounted in Tasker's first book Everest the Cruel Way.