At 26,000 feet / 7900 metres you begin to feel really weak, your digestive system begins to shut down, blood oxygen dwindles, brain cells starve. The route to the final camp goes up the north face through a series of gullies and steepens into downsloping slabby terrain before reaching the site.

George Mallory is considered the first Everest climber. His body was found in 1999 around 26,000 feet / 8,000 metres. Mallory lay face-down, arms outstretched as if to break a sliding fall, with one broken leg and a serious wound to the skull, but otherwise very well-preserved and relatively uninjured.