Secrets of the Underground Season 1 Episode 6 California's Hidden Doomsday 2017
4.3/10 by 3 users
Rob Nelson heads to California to investigate a network for major fault lines that could set off an unprecedented mega-quake. Then, he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.
- Released: 2017-03-21
- Runtime: 60 minutes
- Genre: Reality, Documentary
- Stars:
- Director:
