In the 20th century, a Roman Catholic missionary named Father Carlo Crespi helped the local Indians, the Shuar culture, who gave him some unique gifts that often took the form of elaborately carved artifacts some made of gold or other precious metals. Many of these artifacts feature elaborate carvings and symbols not know to be associated with the Shuar people. One of the presents was metal tablet with 36 symbols that no one could translate.
In 1991, an Ecuadorian man named Patronio Jaramillo who claimed to have entered the cave through a secret entrance back in 1946 as a teenage boy. He claimed that he had to dive into the water, swim through an underwater tunnel then came up. He described wandering through chamber after chamber of ancient relics, including a vast room of books made from gold and other metals – books with unrecognizable writing possibly like those in Father Crespi’s collection – symbols of unknown origin. Jaramillo died before he could show anyone where the cave was located.