Researchers detailed their analysis of the oldest most complete, genetically intact human skeleton discovered in the New World in the journal Science. This project was led by the Mexican government’s National Institute of Anthropology and History and supported by the National Geographic Society.

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00:Divers make their way toward Hoyo Negro, an underwater cave on Mexico’s Yucatán Peninsula where the remains of “Naia,” a 12,000- to 13,000-year-old teenage girl, were found.

11: The dive team uses high-powered lights to explore Hoyo Negro, an underwater cave on Mexico’s Yucatán Peninsula where the remains of “Naia,” a 12,000- to 13,000-year-old teenage girl, were found.

22: Divers examine a juvenile cave bear, one of the more than 26 large mammals found in Hoyo Negro, an underwater cave on Mexico’s Yucatán Peninsula that contains the remains of saber-toothed cats, giant ground sloths and gomphotheres (an extinct relative of the mastodon).

33: The skeleton of a puma, one of the more than 26 large animals found in Hoyo Negro, an underwater cave on Mexico's Yucatán Peninsula that contains the remains of saber-toothed cats, giant ground sloths and gomphotheres (an extinct relative of the mastodon).

42: In order to produce a 3-D model of the Hoyo Negro skull, divers carefully place it on a rotating platform to be photographed.

52: Working near the bottom of the great collapse chamber, the dive team and researchers take detailed photographs of the Hoyo Negro skull.

55: In order to produce a 3-D model of the Hoyo Negro skull, divers carefully place it on a rotating platform to be photographed.

1:03 A diver carefully observes “Naia,” a 12,000- to 13,000-year-old teenage girl whose remains were found in the Hoyo Negro cave on Mexico’s Yucatán Peninsula.

1:11 Working near the bottom of the great collapse chamber, the dive team and researchers conduct detailed photography of the Hoyo Negro skull.