Last week’s announcement that a boot and partial remains believed to belong to the British explorer Sandy Irvine had been found on Mount Everest by a National Geographic documentary crew supercharged interest in a mystery that has endured since he vanished with George Mallory on the mountain 100 years ago.

A National Geographic documentary crew has found the possible partial remains of Andrew Irvine, a British climber who vanished on Mount Everest 100 years ago.

Climbers believe they have found the partial remains of a British mountaineer who might — or might not — have been one of the first two people to climb Mount Everest, a century after their attempt on