Secrets of the Underground (2017) | All episodes

Sneak Peak

Release Date: 2017-02-11

Capone's Escape Tunnels

Release Date: 2017-02-14

Mystery of the Serpent Mound

Release Date: 2017-02-21

America's Buried Massacre

Release Date: 2017-02-28

Rocky Mountain Monsters

Release Date: 2017-03-07

Great Lakes Bermuda Triangle

Release Date: 2017-03-14

California's Hidden Doomsday

Release Date: 2017-03-21

Secret History of the New World

Release Date: 2017-03-28

American Stonehenge

Release Date: 2017-04-04