In 1976, Neil Armstrong, the first man to set foot on the Moon, joined a gigantic British-Ecuadorian expedition to the Cueva de Los Tayos, deep in the Amazon. Why was such a large mission organized, and what was the British interest in what might be found in the cave? Today, geologists and members of esoteric disciplines enter Tayos’s massive underworld to unravel its enigmas. His antagonistic visions will show the reasons why the cave has awakened a passion for decades.