All Episodes of Secrets of the Underground

Season 1

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  7.5/1016 votes

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  Capone's Escape Tunnels

  Season 1 Episode 1 - Aired 2/14/2017

  Rob Nelson investigates rumors of a secret underground escape route used by the infamous gangster Al Capone. In Washington state, Rob tries to uncover who -- or what -- built a vast landscape of earthen mounds in Washington state.

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  7.3/1018 votes

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  Mystery of the Serpent Mound

  Season 1 Episode 2 - Aired 2/21/2017

  Rob Nelson explores mysterious tunnels beneath Denver's airport and capitol building to investigate rumors of a secret organization operating below. In Ohio, he tries to uncover the ancient secrets of a mound shaped like a serpent.

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  7.8/1020 votes

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  America's Buried Massacre

  Season 1 Episode 3 - Aired 2/28/2017

  Rob Nelson hunts for a legendary mass grave that could expose a dark secret of America's industrial past. High in the mountains, a giant lake is mysteriously disappearing, and Rob uses cutting-edge technology to find out why.

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  7.6/1017 votes

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  Rocky Mountain Monsters

  Season 1 Episode 4 - Aired 3/7/2017

  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.

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  7.9/1015 votes

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  Great Lakes Bermuda Triangle

  Season 1 Episode 5 - Aired 3/14/2017

  Rob descends into a cave 30 feet beneath Texas in search of evidence of a mass extinction event. Then, he heads to Lake Michigan to investigate a Bermuda Triangle-like phenomenon that has caused ships to vanish for centuries.

  Director: N/A

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  6.9/1014 votes

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  California's Hidden Doomsday

  Season 1 Episode 6 - Aired 3/21/2017

  Rob Nelson heads to California to investigate a network for major fault lines that could set off an unprecedented mega-quake. Then, he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.

  Director: N/A

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  7.5/1013 votes

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  Secret History of the New World

  Season 1 Episode 7 - Aired 3/28/2017

  Rob investigates ancient ruins in New England that suggest Europeans arrived in the Americas almost 1,000 years before Columbus. Then, he heads to California where a dormant super-volcano may be showing new signs of life.

  Director: N/A

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  7.2/1014 votes

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  American Stonehenge

  Season 1 Episode 8 - Aired 4/4/2017

  Rob Nelson investigates the mysterious pattern of rocks at the bottom of Lake Michigan known as Underwater Stonehenge. At the notorious Alcatraz prison, Rob uses state-of-the-art technology in search of rumored escape tunnels.

  Director: N/A

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