It's more than a mile long!

BENJAMIN TAUB
Freelance Writer

After centuries of rumor and speculation, archaeologists have finally confirmed the existence of a colossal underground tunnel system beneath the Peruvian city of Cusco. Built by the ancient Inca, the labyrinth – or Chincana – radiates outwards from the Temple of the Sun, extending for more than a mile towards a fortress on the edge of the city.

The discovery was announced at a press conference during which researchers explained how they located the subterranean passages in three stages. The first of these involved studying historical texts from the 16th to 18th centuries in search of references to the Chincana and its whereabouts.

Among the most enlightening accounts was one written by an anonymous Spanish Jesuit in 1594, who explained that the main tunnel ran beneath the bishop’s houses behind Cusco Cathedral. The same text indicated that the passageway began at the Temple of the Sun – or Coricancha – and ended at the citadel of Sacsahuaman, some 1.75 kilometers (1.1 miles) away.

Speaking to reporters at a press conference, archaeologist Jorge Calero Flores explained that these centuries-old documents “gave us an idea of where [the Chincana] is.”

The second phase of the investigation saw the researchers conduct acoustic prospecting, essentially banging on the ground and listening for areas of deeper resonance, indicating the presence of hollow chambers. Finally, the team made use of ground-penetrating radar to more accurately map out the tunnel system.

More:
https://www.iflscience.com/huge-ancient-inca-underground-labyrinth-discovered-beneath-cusco-starting-at-sun-temple-77617