Giant Underwater Cave Was Hiding Oldest Human Skeleton in the Americas

http://video.nationalgeographic.com/video/expedition-raw/161102-sciex-exraw-giant-underwater-cave-hiding-americas-oldest-human-skeleton?utm_source=Facebook&utm_medium=Social&utm_content=link_fb20161103video-skeletoncave&utm_campaign=Content&sf40835599=1

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