Climate change is thinning snow and ice around the Himalayas, increasingly exposing the bodies of those who died chasing their dream of scaling the world’s highest mountain.
Briton Andrew Irvine went missing in 1924 alongside climbing partner George Mallory as the pair attempted to be the first to reach Everest’s summit, 8,848m above sea level.
Mr Mallory’s body was found in 1999 but clues about Mr Irvine’s fate were elusive until a National Geographic team discovered a boot, still covering the remains of a foot, on the peak’s Central Rongbuk Glacier.
On closer inspection, they found a sock with "a red label that has A.C. Irvine stitched into it", the magazine reported.
The discovery could give further clues to the location of the team’s personal effects and may help resolve one of mountaineering’s most enduring mysteries: whether Mr Irvine and Mr Mallory ever managed to reach the summit.
That could confirm Mr Irvine and Mr Mallory as the first to successfully scale the peak, nearly three decades before the first currently recognised summit in 1953 by climbers Edmund Hillary and Tenzing Norgay.
"It tells the whole story about what probably happened," Mr Irvine’s great-niece Julie Summers told National Geographic.