Where To Stream Secrets of the Underground Season 1 Episode 6
California's Hidden Doomsday
- Aired March 21, 2017
- 60 Min
- Rated 8.7
- Number 2 Of 16 Rated Episodes
Heading to California to investigate a network for major fault lines that could set off an unprecedented mega-quake; he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.