The 16 young men (of 45 passengers and crew) of a 1972 plane crash in the Andes recall their ordeal, which found them stranded for 72 days on a snowy peak after the search for the plane's wreckage was called off. To prevent starvation, the survivors did the unthinkable: They cannibalized the bodies of passengers who had perished. Included: interviews with the men, who return to the site of the crash; archival footage.