Secrets Underground

7:00 PM to 8:00 PM

Thursday 10 October

California's Hidden Doomsday

Season 1 Episode 6 of 8

Rob Nelson heads to California to investigate a network for major fault lines that could set off a mega-quake. Plus, he explores a mysterious sinkhole

Secrets Underground airs on Discovery History +1 at 7:00 PM, Thursday 10 October. (Subtitles.)

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