Secrets of the Underground Season 2

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

Actor: Rob Nelson

Director: Dominic Brigstocke

Country: USA

Duration: 1h

Quality: HD

Release: 2017