Secrets Underground

9:00 AM to 10:00 AM

Friday 11 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 at 9:00 AM, Friday 11 October. (Subtitles.)

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