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Secrets of the Underground - TV Documentaries (2017)

Director:
Cast: Rob Nelson, Tim Bechtel, Stefan Burns, Adam Cho, Brad Aagaard, Griffin Alberti, Kenneth Bader, Hank Bailey, Tracy Beach, Brent Breithaupt, Jarrod Burks, Jennifer Burnham, Rufus Catchings, Nigel Crook, Mike Feves, Peter Gavette, Mark W. Holley, Aubri Jenson, Larry Johnson, Tim Kilgannon, Bradley T. Lepper, Martin Lockley, Ernie Lundelius, John A. Martini, Neffra Matthews, Jim Meyer, Janet Monge, Heath Montgomery, Keith Muhlestein, John O'Shea

Synopsis

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.
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