In October 1972, a plane crashed in a remote part of the Andes, and a group of young rugby players survived for 72 days in the snow with no means of finding food.
Dr Roberto Jorge Canessa is a Uruguayan peadiatric cardiologist and one of the 16 survivors of the Uruguayan Air Force Flight 571.
Canessa spoke to BBC News about his harrowing experience.
The survivors were discovered after two of the players trekked for days with no specialist equipment or clothes to get help.
The starving passengers of Uruguayan Air Force Flight 571 were only able to stay alive by eating the bodies of those who did not survive.
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