The Khumbu Icefall is an icefall located at the head of the Khumbu Glacier ,at an altitude of 5,486 metres (17,999 ft) The Khumbu Icefall is the first challenge of climbing Mt. Everest.Constantly in motion, the gigantic Icefall is a labyrinth of ice blocks (some of which are as high as houses) and deep crevasses that slides from the glacier basin between Everest, Lhotse and Nuptse towards Base Camp