At Teotihuacán, an ancient capital in the Valley of Mexico, robots have been employed to explore a newly-discovered tunnel leading from the Temple of the Plumed Serpent. One of the most exciting aspects of this tunnel is that, unlike other tunnels discovered in the past, this one had not been looted in antiquity. The tunnel apparently was sealed 1,800 years ago, leaving the treasures within protected.
A Secret Tunnel Found in Mexico May Finally Solve the Mysteries of Teotihuacán
By Matthew Shaer