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Water may have been a key component in Mexico's Teotihuacan site, experts say

This May 22, 2014 photo released by Mexico's National Institute of Anthropology and History (INAH) shows sculptures unearthed at the Teotihuacan archeological site in Mexico. Mexican archaeologists have concluded a yearslong exploration of a tunnel sealed nearly 2,000 years ago at the ancient city of Teotihuacan and found thousands of relics. Teotihuacan dominated central Mexico centuries before the rise of the Aztecs in the 14th century. (AP Photo/Proyecto Tlalocan, INAH)

This May 22, 2014 photo released by Mexico's National Institute of Anthropology and History (INAH) shows sculptures unearthed at the Teotihuacan archeological site in Mexico. Mexican archaeologists have concluded a yearslong exploration of a tunnel sealed nearly 2,000 years ago at the ancient city of Teotihuacan and found thousands of relics. Teotihuacan dominated central Mexico centuries before the rise of the Aztecs in the 14th century. (AP Photo/Proyecto Tlalocan, INAH)  (AP)

Recent discoveries at Mexico's Teotihuacan ruin site suggest that water features may have been a key part of the complex.

The water connection would be an odd twist for Teotihuacan, a 2,000-year-old complex in an arid valley north of Mexico City.

Archaeologists reported last week they have largely excavated a 340-foot (103-meter) tunnel under the Temple of the Plumed Serpent.

Archaeologist Sergio Gomez said Wednesday that water marks on the wall indicate the chambers and offerings at the end of the tunnel were under water.

Gomez said the plaza outside the temple also probably had been flooded with water and used as a reflecting pool. Researchers found that drains around the Ciudadela plaza had been ritually blocked with material that included the decapitated, mutilated remains of 50 human sacrifice victims.

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