Season 4
Episodes
1. Mayan Apocalypse
2021-09-07
Don Wildman explores deep below ancient ruins as he searches for clues pointing to the true fate of the once-mighty Mayan empire.
2. America's Military Underground
2021-09-14
Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities... right under our feet.
3. America's Unmapped Murder Tunnels
2021-09-21
Don 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.
4. America's Ancient Ancestors
2021-09-28
Don 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.
5. The Pirate Queen's Lair
2021-10-05
Don 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.
6. Templars and The Founding Fathers
2021-10-12
Don 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
7. Secrets of the Ancient Metropolis
2021-10-19
Don explores the massive underground cities in the mountains of Turkey that may have been home to the first civilization on Earth.
8. The Lost Aztec Colony
2021-10-26
Don follows the clues hidden underground as he searches for evidence of 10,000 Aztecs who fled Mexico and disappeared somewhere in America.