4:00 AM: Secrets Of The Underground (S1 E6) (S1) | Discovery Science | 2/14 2026

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Secrets Of The Underground « at 4:00 AM on Discovery Science

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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