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.
Previously on TV
Secrets Underground
California's Hidden Doomsday
Previously shown on Discovery .Science on Fri 18 Sep 2026 at 13:00.
This showing has ended
This showing was on Discovery .Science at 13:00 on Fri 18 Sep 2026. See future airings below or open the main programme page for the latest TV times.
Airing details
ChannelDiscovery .Science
StartsFri 18 Sep 2026, 13:00
EndsFri 18 Sep 2026, 14:00
Episode / edition: California's Hidden Doomsday
SkySky Q / Satellite167Next showing of Secrets Underground
The next currently listed showing is Thu 24 Sep 2026, 13:00 on Discovery .Science.
See all current showings