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8:00 PM: Secrets Of The Underground (S1 E6) (S1) | Discovery Channel | 2/14 2026 Discovery Channel
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Secrets Of The Underground « at 8:00 PM on Discovery Channel

Episode 6

Broadcast info
Published: 2017
Episode: California's Hidden Doomsday

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

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