Mysterious tunnel discovered under Mexican ruins
A tunnel is discovered beneath temple ruins in Teotihuacan, Mexico, that experts believe lead to tombs and an underground city dating back to 100 B.C.
A long-sealed tunnel has been found under the ruins of Teotihuacan, and chambers that seem to branch off it may hold the tombs of some of the ancient city's early rulers.
Experts say a tomb discovery would be significant. because the social structure of Teotihuacan remains a mystery after nearly 100 years of archaeological exploration at the site, which is best known for the towering Pyramids of the Moon and the Sun.
No depiction of a ruler, or the tomb of a monarch, has ever been found, setting the metropolis apart from other pre-Hispanic cultures that deified their rulers.
Archaeologists had suspected the hidden tunnel was there after a heavy rainstorm in 2003 caused the ground to sink at the foot of the Temple of Quetzacoatl, in the central ceremonial area of the ruins just north of Mexico City.
Starting last year, they began digging, and after eight months of excavation, they reached the roof of the tunnel last month, 40 feet (12 meters) below the surface.