Maya Warriors playing the Mesoamerican ballgame as seen on National...

Maya Warriors playing the Mesoamerican ballgame as seen on National Geographic Channel's " The Mayan Apocalypse 2012." Premieres Mon., Dec. 3, 2012, at 9 PM ET/PT. Credit: Story House Productions

But where did this specific date of doom come from? That's what this pair of specials sets out to explore. The first features BBC presenter Paul Murton, who travels to the Yucatán to figure out the genesis of the so-called "13th Baktun," the 144,000-daylong cycle on the Mayan calendar that comes to an end in a couple of weeks. (Gulp.)

In "Maya Underworld," Diego Buñuel -- yes, he is indeed the grandson of filmmaker Luis Buñuel -- leads a diving expedition through a pair of Yucatán cenotes, ancient sinkholes in the limestone where the Maya once performed human sacrifices.

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