Underground season 2 is available in: English on Netflix UK

Watch it on Netflix UK

Secrets of the Underground (2017–)
Rating: 6.8/10 (43 votes)
Director: N/A
Writer: N/A
Stars: Rob Nelson
Runtime: 60 min
Rated: TV-PG
Genre: Documentary
Released: 11 Feb 2017
Plot: 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 ...