About this showing of Secrets Underground
Rob Nelson investigates the mysterious rocks at the bottom of Lake Michigan known as Underwater Stonehenge. Plus, the search for escape tunnels in Alcatraz.
Previously on TV
Secrets Underground
American Stonehenge
Previously shown on Discovery .Science on Wed 16 Sep 2026 at 13:00.
This showing has ended
This showing was on Discovery .Science at 13:00 on Wed 16 Sep 2026. See future airings below or open the main programme page for the latest TV times.
Airing details
ChannelDiscovery .Science
StartsWed 16 Sep 2026, 13:00
EndsWed 16 Sep 2026, 14:00
Episode / edition: American Stonehenge
SkySky Q / Satellite167Next showing of Secrets Underground
The next currently listed showing is Mon 21 Sep 2026, 13:00 on Discovery .Science.
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