Visitors on Monday look on at the Quetzalcoatl Temple at the Teotihuacan archeological site, about 60km north of Mexico City. A robot named Tlaloc II, after the Aztec god of rain, has discovered three ancient chambers at the last stretch of unexplored tunnel at the 2,000-year-old site on Monday, the first robotic discovery of its kind in Mexico.Apr 24, 2013
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