The Mayan calendar didn't actually end. It was a beautiful celebration and " rebirth" the calendar continues.
Also The Mayan calendar never actually said the world was going to end. Silly people. XD
In addition there are no reptilians living under the desert.
EDIT: THIS is where that ridiculous story came from:
Q: What is the origin of the prediction that the world will end in 2012?
A: The story started with claims that Nibiru, a supposed planet discovered by the Sumerians, is headed toward Earth. This catastrophe was initially predicted for May 2003, but when nothing happened the doomsday date was moved forward to December 2012 and linked to the end of one of the cycles in the ancient Mayan calendar at the winter solstice in 2012 - hence the predicted doomsday date of December 21, 2012.
The Mayan connection "was a misconception from the very beginning," says Dr. John Carlson, director of the Center for Archaeoastronomy. "The Maya calendar did not end on Dec. 21, 2012, and there were no Maya prophecies foretelling the end of the world on that date."
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