Secret tunnel found 30 feet below the Pyramid of the Moon in Mexico's Teotihuacan ruins may have been built to 'replicate the underworld'

Twelve small pyramid platforms surround the Plaza of the Moon, believed to be to allow thousands of the early residences to witness sacrificial rituals.

Archaeologists at Mexico's Teotihuacan ruins site say they have found evidence that the city's builders may have dug a secret tunnel under the Pyramid of the Moon.It goes from the Pyramid to the central square, which it is believed was used for human sacrifices and other rituals in front of an estimated 100,000 people.The National Institute of Anthropology and History says researchers used a CT scans to discover the tunnel about 30 feet (10 meters) below the surface of the plaza in front of the pyramid.

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