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Secrets of the Underground (2017)

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.

Genres: Documentary

Actors: Rob Nelson，Stefan Burns，Tim Bechtel，Adam Cho，Jared Peacock，Valerie Van Heest，Tracy Beach，Bradley T. Lepper，Brent Breithaupt，Griffin Alberti，Janet Watt，Jennifer Burnham，Larry Johnson，Tim Kilgannon，Aubri Jenson，Luther Strayer，Dale Rucker，Frank Watson

Directors:

Country:

Episode: 8 eps

Duration: 1h

Quality: 1080p

Release: 2017

IMDb: 6.5