A portal to Maya Underworld found in Mexico?

National Geographic news unveil that some archaeologists might have found a portal to Maya Underworld in Mexico's Yucatán Peninsula. A labyrinth filled with stone temples and pyramids in 14 caves, some underwater. According to the archaeologosits, they found "a nearly 300-foot (90-meter) concrete road that ends at a column standing in front of a body of water".