Excavations at a 2,000-year-old Mexican ruin site suggest it might have had a surprising history - with a series of water features.

The water connection would be an odd twist for the Teotihuacan complex, which is in an arid valley north of Mexico City.

Archaeologists said they had largely excavated a 340ft tunnel under the Temple of the Plumed Serpent, and water marks on the wall indicate the chambers and offerings at the end of the tunnel were under water.

Archaeologist Sergio Gomez said the plaza outside the temple was probably also flooded with water and used as a reflecting pool, while 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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