About this showing of Secrets Underground
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.
Coming up on TV
Secrets Underground
California's Hidden Doomsday
On Discovery .Science on Thu 3 Sep 2026 at 04:00, ending at 05:00.
When is it on?
Secrets Underground starts at 04:00 on Discovery .Science on Thu 3 Sep 2026.
Airing details
ChannelDiscovery .Science
StartsThu 3 Sep 2026, 04:00
EndsThu 3 Sep 2026, 05:00
Episode / edition: California's Hidden Doomsday
SkySky Q / Satellite167Next showing of Secrets Underground
The next currently listed showing is Thu 3 Sep 2026, 05:00 on Discovery .Science.
See all current showings