Recently, archaeologists confirmed a long-held rumor: the existence of a labyrinth of underground tunnels extending out from the temple, sometimes over a mile in length. Related Story He Discovered America’s Greatest Sunken TreasureThe Peru Archaeologists Association said that the tunnels were created by the Inca people. Calero Flores said that the tunnel system is roughly 8.5 feet wide and 5.2 feet high. The path to finding the ancient labyrinth started with Jesuit texts from the 16th century. Researchers believe that the tunnel system was an underground representation of the above-ground street network of the ancient Incan city of Cusco.