Secrets Of The Underground: Season 2

Secrets Of The Underground: Season 2

Director: N/A

Actors: Rob Nelson

Genres: Documentary

Country: USA

Release Year: 2017

Duration: 60 min

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 ...

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