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  1. Using cutting-edge technologies such as ground penetrating radar (GPR), LIDAR (Light Detection and Ranging), and 3-D imaging, scientists research fascinating underworlds of secret tunnel networks, ancient structures, and bizarre geological occurrences that offer glimpses into our history.

    • (182)
    • 2017-02-11
    • Documentary
    • 60
  2. May 8, 2017 · Season 1. Scientist Rob Nelson investigates the strangest underground locations in the world, using the latest technology and research to shed new light on the secrets that lie just beneath our feet. 2017 8 episodes. NR.

  3. Secrets of the Underground - watch online: streaming, buy or rent. Currently you are able to watch "Secrets of the Underground" streaming on Discovery+ Amazon Channel, Discovery + or buy it as download on Apple TV, Vudu, Amazon Video, Google Play Movies.

    • (31)
    • 2
    • TV-PG
    • 13
  4. In "Secrets of the Underground," Rob Nelson, an ecologist by trade and an explorer by pastime, travels the country to investigate long-lost, subterranean phenomena.

  5. In "Secrets of the Underground," Rob Nelson, an ecologist by trade and an explorer by pastime, travels the country to investigate long-lost, subterranean phenomena. Nelson looks at all things...

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  6. Synopsis. With the help of a WAAC group, Mr. District Attorny smashes a Nazi spy-ring that is selling counterfeit War Stamps and Bonds. Cast. John Hubbard. P. Cadwallader Jones. Virginia Grey. Terry Parker.

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  8. With over one million views on YouTube, the Londonist series 'Secrets of the Underground' became an online hit between 2013 and 2014. Geoff Marshall tours the Tube line by line,...