They crashed in the mountains and turned to cannibalism. He focuses on the humanity
Briefly

"So the first thing I did was to go to the Valley of the Tears, in the Argentinian side of the Andes where the plane crashed. And I was there at the same time of the year. So I was able to sleep there in a small camp and to experience the altitude sickness, to experience the sense of loneliness that you have there. It was very impressive."
"Yeah, the muffling of the snow and and the visuals too. I mean, there's so many scenes in the movie where it seems like they're almost specks against an entirely white backdrop and you can just feel the isolation of the survivors just out there by themselves with no other living thing in sight."
Read at www.npr.org
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