If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help… or as a refuge from an alien attack? Rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico continue to swirl, Native American legends mention strange inner-Earth beings, and recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind.
This documentary from History Channel hypothesizes that various underground places may have been extraterrestrial lairs, such as a lost cave in Ecuador said to hold metal tablets containing alien knowledge, the underground city of Derinkuyu in Turkey, Native American legends of “inner-earth” beings, and rumors of a secret U.S. military base supposedly built alongside aliens inside the Archuleta Mesa near Dulce, New Mexico.