Season 4

1. Mayan Apocalypse

Don Wildman explores deep below ancient ruins as he searches for clues pointing to the true fate of the once-mighty Mayan empire.

2021-09-07 • 43 min

2. America's Military Underground

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.

2021-09-14 • 43 min

3. America's Unmapped Murder Tunnels

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.

2021-09-21 • 43 min

4. America's Ancient Ancestors

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.

2021-09-28 • 43 min

5. The Pirate Queen's Lair

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.

2021-10-05 • 43 min

6. Templars and The Founding Fathers

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

2021-10-12 • 43 min

7. Secrets of the Ancient Metropolis

Don explores the massive underground cities in the mountains of Turkey that may have been home to the first civilization on Earth.

2021-10-19 • 43 min

8. The Lost Aztec Colony

Don follows the clues hidden underground as he searches for evidence of 10,000 Aztecs who fled Mexico and disappeared somewhere in America.

2021-10-26 • 43 min