Hidden tunnel could lead to Mayan 'entrance to the underworld'

By Mark Tutton, CNN

Updated 1755 GMT (0155 HKT) February 2, 2018

Archaeologists are hoping to discover an underwater cavern hidden beneath the imposing "El Castillo" temple, at Chichen Itza, Mexico.
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Archaeologists are hoping to discover an underwater cavern hidden beneath the imposing "El Castillo" temple, at Chichen Itza, Mexico.
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Chichen itza, in Yucatan state, is one of the most impressive achievements of the ancient Mayan people. Pictured, thousands of tourists surround "El Castillo" during a spring equinox celebration.
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Chichen itza, in Yucatan state, is one of the most impressive achievements of the ancient Mayan people. Pictured, thousands of tourists surround "El Castillo" during a spring equinox celebration.
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Water-filled caverns -- called cenotes -- sustained the Mayan civilization, and were central to its spiritual beliefs. Pictured, Holtun cenote in Chichen Itza.
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Water-filled caverns -- called cenotes -- sustained the Mayan civilization, and were central to its spiritual beliefs. Pictured, Holtun cenote in Chichen Itza.
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