Season 4

1. Mayan Apocalypse

2021-09-07 · 43m

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 · 43m

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 · 43m

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 · 43m

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 · 43m

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 · 43m

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 · 43m

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 · 43m

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