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An undated graphic shows the tunnel that may lead to a royal tombs discovered underneath the Quetzalcoatl temple in the ancient city of Teotihuacan in this October 29, 2014 National Institute of Anthropology and History (INAH) handout picture. A sacred tunnel discovered in the ancient Mexican city of Teotihuacan is filled with thousands of ritual objects and may lead to royal tombs, the lead Mexican archaeologist on the project said on Wednesday. The entrance to the 1,800-year-old tunnel was first discovered in 2003, and its contents came to light thanks to excavations by remote-control robots and then human researchers, archeologist Sergio Gomez told reporters. (Photo by Reuters/INAH)
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