About this showing of Secrets Underground
Rob Nelson investigates mysterious tunnels under Denver's airport. Plus, in Ohio he tries to uncover the secrets of a giant serpent-shaped mound.
Exact TV airing
Secrets Underground
Mystery Of The Serpent Mound
This broadcast is scheduled on Discovery .Science on Tuesday 1 September 2026, 05:00, ending at 06:00.
When is this airing on?
Secrets Underground starts at 05:00 on Discovery .Science on Tue 1 Sep 2026.
Airing details
ChannelDiscovery .Science
StartsTue 1 Sep 2026, 05:00
EndsTue 1 Sep 2026, 06:00
Episode / edition: Mystery Of The Serpent Mound
SkySky Q / Satellite167Next showing of Secrets Underground
The next currently listed showing is Mon 31 Aug 2026, 13:00 on Discovery .Science.
See all current showingsOther current airings
Mon 31 Aug 13:00Secrets Underground
American StonehengeDiscovery .ScienceMon 31 Aug 14:00Secrets Underground
Mystery Of The Serpent MoundDiscovery .ScienceMon 31 Aug 21:00Secrets Underground
Lost Pirate City Of TreasureDiscovery .HistoryMon 31 Aug 22:00Secrets Underground
Lost Pirate City Of TreasureDiscovery .History+ 1Tue 1 Sep 04:00Secrets Underground
American StonehengeDiscovery .Science
American StonehengeDiscovery .ScienceMon 31 Aug 14:00Secrets Underground
Mystery Of The Serpent MoundDiscovery .ScienceMon 31 Aug 21:00Secrets Underground
Lost Pirate City Of TreasureDiscovery .HistoryMon 31 Aug 22:00Secrets Underground
Lost Pirate City Of TreasureDiscovery .History+ 1Tue 1 Sep 04:00Secrets Underground
American StonehengeDiscovery .Science