U&Yesterday 2019 - 2022 2 seasons 20 eps Returning series

Underground Worlds

2019 - 2022 2 seasons 20 eps

7.1

Season 2

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Season 1

Season 2

All episodes

45 min

S2 · E1 · Jan 10, 2022

Murder Raid Tunnels Episode 1

Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels.

45 min

S2 · E2 · Jan 17, 2022

Grand Canyon's Lost Treasure Episode 2

Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK.

45 min

S2 · E3 · Jan 24, 2022

Cincinnati's Secret Caverns Episode 3

Exploring the forgotten underworld hiding beneath the streets of Cincinati, USA. Plus, a state-of-the-art Cold War fortress on the shores of Denmark.

45 min

S2 · E4 · Jan 31, 2022

Hotel Bunker of the Apocalypse Episode 4

Exploring the secret, Cold War US government bunker hidden under Greenbrier Hotel, West Virginia; Plus, delve into the depths of a former slate mine in Wales, UK.

45 min

S2 · E5 · Feb 7, 2022

Mystery of the Kentucky Cave Episode 5

Exploring the vast 400-mile Mammoth Cave in Kentucky, USA. Plus, a newly constructed opening into a metal mine in Wales - untouched for over 70 years.

45 min

S2 · E6 · Feb 14, 2022

Ireland's Underground Alcatraz Episode 6

Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. Plus, a former submarine base in the fjords of northern Norway.

45 min

S2 · E7 · Feb 21, 2022

Medieval Maze of Secrets Episode 7

Exploring long narrow tunnels beneath Exeter that were built in medieval times to protect the city. Plus, a marble quarry under the pine forests of Vermont.

45 min

S2 · E8 · Feb 28, 2022

Buried Lab of the Black Hills Episode 8

Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark.

45 min

S2 · E9 · Mar 7, 2022

Subterranean Silo Survival Episode 9

Exploring old tunnels in an abandoned tin mine beneath the moors of Cornwall. Plus, former Atlas missile siloes in Kansas and tunnels hiding under Valetta.

45 min

S2 · E10 · Mar 14, 2022

Italy's Subterranean Secret Episode 10

Exploring caves beneath Orvieto in Italy, originally built by the Etruscans long before the Roman Empire. Plus, a former limestone mine under Kansas City.

10 episodes in Season 2

Some details come from TheTVDB.

Underground Worlds

Season 2

Murder Raid Tunnels Episode 1

Grand Canyon's Lost Treasure Episode 2

Cincinnati's Secret Caverns Episode 3

Hotel Bunker of the Apocalypse Episode 4

Mystery of the Kentucky Cave Episode 5

Ireland's Underground Alcatraz Episode 6

Medieval Maze of Secrets Episode 7

Buried Lab of the Black Hills Episode 8

Subterranean Silo Survival Episode 9

Italy's Subterranean Secret Episode 10

Cast

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Underground Worlds

Season 2

Murder Raid Tunnels Episode 1

Grand Canyon's Lost Treasure Episode 2

Cincinnati's Secret Caverns Episode 3

Hotel Bunker of the Apocalypse Episode 4

Mystery of the Kentucky Cave Episode 5

Ireland's Underground Alcatraz Episode 6

Medieval Maze of Secrets Episode 7

Buried Lab of the Black Hills Episode 8

Subterranean Silo Survival Episode 9

Italy's Subterranean Secret Episode 10

Cast

Details Dates · production Show

If you liked Underground Worlds