The “Swiss Machine” Ueli Steck is one of the world's best alpinists alive today.

He has already climbed Everest without supplemental oxygen once and has many other Himalayan ascents to his name. Now, after a foiled 2013 bid, he will attempt perhaps the most ambitious, Himalayan climbing expedition ever: an alpine-style enchainment of Everest and Lhotse. News Update: Ueli Steck has died in a fall on Nuptse face while training for the Everest push. Our community mourns his loss.