Season 4
8 episodes · Sep 7, 2021
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S4E1Mayan Apocalypse
Sep 7, 202143mDon Wildman explores deep below ancient ruins as he searches for clues pointing to the true fate of the once-mighty Mayan empire.
S4E2America's Military Underground
Sep 14, 202143mDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities... right under our feet.
S4E3America's Unmapped Murder Tunnels
Sep 21, 202143mDon uses brand-new mapping technology to expose the dark and deadly uncharted spaces beneath American cities. He explores the criminal underworld below Portland, Oregon; Seattle, Washington; Chicago, Illinois; and Los Angeles, California.
S4E4America's Ancient Ancestors
Sep 28, 202143mDon goes deep beneath the great lakes and explores flooded caves as he searches for evidence of a mysterious, cave-dwelling society that may have been the first people to reach America.
S4E5The Pirate Queen's Lair
Oct 5, 202143mDon explores newly discovered ruins and caves in Croatia as he uncovers the true story of a formidable queen who dared to defy the mighty Roman Empire.
S4E6Templars and The Founding Fathers
Oct 12, 202143mDon goes deep beneath a Knights Templar stronghold in Turkey to explore a provocative theory that may link the fabled secret society to the founding fathers of America. English
S4E7Secrets of the Ancient Metropolis
Oct 19, 202143mDon explores the massive underground cities in the mountains of Turkey that may have been home to the first civilization on Earth.
S4E8The Lost Aztec Colony
Oct 26, 202143mDon follows the clues hidden underground as he searches for evidence of 10,000 Aztecs who fled Mexico and disappeared somewhere in America.