Secrets of the Underground Season 1 Episode 4
Rocky Mountain Monsters
Rob Nelson examines a set of bizarre markings that suggest a violent clash between prehistoric beasts. In California, he investigates if a strange lake is a home to alien life.
1 - 8American StonehengeApr. 04, 2017- 1 - 7Secret History of the New WorldMar. 28, 2017
- 1 - 6California's Hidden DoomsdayMar. 21, 2017
- 1 - 5Great Lakes Bermuda TriangleMar. 14, 2017
- 1 - 4Rocky Mountain MonstersMar. 07, 2017
- 1 - 3America's Buried MassacreFeb. 28, 2017
- 1 - 2Mystery of the Serpent MoundFeb. 21, 2017
- 1 - 1Capone's Escape TunnelsFeb. 14, 2017
