Secrets Underground

1:00 AM to 2:00 AM

Tuesday 10 February

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 Channel at 1:00 AM, Tuesday 10 February. (Subtitles.)

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