![Secrets of the Underground](/img/bg.png?https://m.media-amazon.com/images/M/MV5BN2Y5YWQwZmItOTIxYi00ZmI3LWEyZDYtYzY4M2I3MmRkN2NlXkEyXkFqcGdeQXVyNTM3MDMyMDQ@._V1_UY268_CR87,0,182,268_AL_.jpg)
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.