Mallory and Irvine Mystery (02:24)
George Leigh Mallory pioneered climbing Mount Everest. In 1924, he and climbing partner Andrew “Sandy” Irvine disappeared near the summit. No one knows if they reached the summit or not.
1999 Search for Mallory and Irvine (03:22)
Thom Pollard was part of the search for Mallory and Irvine. They found Mallory's mummified body that had a broken leg. The camera, which could have proved whether he and Irvine summited Everest, was not on his body.
Irvine's Location (04:39)
Tom Holzel thinks he has GPS coordinates for the site of Irvine's body, and possibly the camera. He has eyewitness accounts and mapping photographs of a body of a deceased climber. Pollard and Mark Synnott are prepared to climb to the site.
1924 Expedition (03:36)
One team member brought a camera and captured some of the expedition. Pollard and Synnott will follow the same route. Mallory and Irvine had far less equipment and doctors speculate they would die while sleeping with so little oxygen.
Search Expedition (06:08)
James McGuiness, who has summited Everest five times, acts as Pollard and Synnott's guide. Mallory and Irvine were last seen on a ridge near the summit, and it will take the expedition days to the area is known as the death zone.
North Col (05:15)
The search expedition reaches the pass and high winds come in overnight. The team uses drones to search the area where Mallory and Irvine were last seen and take photos.
Holzel's Theory (03:41)
Holzel believes Mallory and Irvine got separated during a snowstorm as they hurried down from the summit. The team wants to climb to the spot where Irvine might have sought shelter, but the weather forces them back to advanced base camp.
Everest Crowds (03:45)
The search expedition is at advanced base camp during a good weather window that drives hundreds of people to the summit. Long lines make the news and cause multiple deaths. Synnott understands the allure of summiting Everest as he misses his chance.
Pollard's TIA (03:45)
Pollard has a transient ischemic attack and cannot continue the expedition. The team's high-altitude doctor worries Pollard might have a stroke and die. The expedition continues without him.
Mystery of Irvine's Fate (05:31)
The mystery of what happened to Irvine drives Synnott to continue. The last photograph of Irvine shows him leaving North Col, wearing oxygen tanks, with Mallory. Team member Noel Odell was the last person to see them alive.
Everest Summit (07:30)
The expedition team climbs to the summit. Experts debate whether Mallory and Irvine could have reached it based on their equipment and climbing ability.
Holzel's Spot (06:02)
Synnott heads to the possible location of Irvine's body. He must go off-rope to get to the exact location. He does not find anything.
Mystery Remains (04:12)
Synnott did not find anything at Holzel's identified location. He believes Irvine's body was there in 1960 and 1995 but fell sometime after.
Credits: Lost on Everest (00:07)
Credits: Lost on Everest
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