Archaeologists in Mexico have discovered a mysterious tunnel and chamber beneath the Pyramid of the Moon in the ancient city of Teotihuacán.

Researchers from Mexico’s National Institute of Anthropology and History (INAH) and the Institute of Geophysics at the National Autonomous University of Mexico (UNAM) located the hidden spaces at the famous site near Mexico City.

With a diameter of 49 feet, the chamber may be a ritual space that was used for funerals, according to experts. The hidden room and its tunnel could be linked to the ancient culture’s concept of the underworld, they say, in a statement.

The chamber and tunnel were discovered using electrical resistance technology in Summer 2017. The results of the archaeologists’ study have just been announced.

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