Secrets of the Underground

California's Hidden Doomsday

TV-PG
S1 • E6    Mar 21, 2017    60m
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.

Where to Watch Secrets of the Underground - S1 • E6

 

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