List of episodes of the series «Secrets of the Underground»

Capone's Escape Tunnels

• Episode number: 1
• Episode duration: 60 min.
• Episode description:
  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.

Mystery of the Serpent Mound

• Episode number: 2
• Episode duration: 60 min.
• Episode description:
  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.

America's Buried Massacre

• Episode number: 3
• Episode duration: 60 min.
• Episode description:
  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.

Rocky Mountain Monsters

• Episode number: 4
• Episode duration: 60 min.
• Episode description:
  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.

Great Lakes Bermuda Triangle

• Episode number: 5
• Episode duration: 60 min.
• Episode description:
  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.

California's Hidden Doomsday

• Episode number: 6
• Episode duration: 60 min.
• Episode description:
  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.

Secret History of the New World

• Episode number: 7
• Episode duration: 60 min.
• Episode description:
  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.

American Stonehenge

• Episode number: 8
• Episode duration: 60 min.
• Episode description:
  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.