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Secrets of the Underground

American Stonehenge

Season 1 Episode 8
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.
  • 43 min
  • TV-PG
  • Premiered 04/04/2017