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Secrets of the Underground Season 2 (2017)

Trailer
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.

Genre: Documentary

Actor: Rob Nelson

Director: Dominic Brigstocke

Country: USA

Runtime: 1h

Quality: HD

Release: 2017

IMDb: 6.8/10