Report
Secrets of the Underground 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.
Duration: 60 min/episode
Quality: HD
Release: 2017
IMDb: 6.7
Keywords: secrets of the underground