Remains of Sandy Irvine believed to have been found on Everest

When they spotted it, there was no mistaking what they were looking at: a boot melting out of the ice. As they drew closer, they could tell the cracked leather was old and worn, and the sole was studded and bracketed with the diamond-patterned steel hobnails of a bygone era of climbing.  In September, on the broad expanse of the Central Rongbuk Glacier, below the north face of Mount Everest, a National Geographic documentary team that included the photographer and director Jimmy Chin, along with filmmakers and climbers Erich Roepke and Mark Fisher, examined the boot more closely. Inside, they discovered a foot, remains that they instantly recognized as belonging to Andrew Comyn Irvine, or Sandy, as he was known, who vanished 100 years ago with the famed climber George Mallory. “I lifted up the sock,” Chin says, describing the moment, “and there’s a red label that has A.C. IRVINE stitched into it.” Chin says he and his companions recognized the significance of the…