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TV series

Underground Worlds

Latest episode

S2 E10 · Italy's Subterranean Secret

About Underground Worlds

Underground Worlds is a documentary TV series that premiered on U&Yesterday on September 25, 2019. It has 2 seasons and 20 episodes so far and is still airing new episodes. The latest episode, Season 2 Episode 10 "Italy's Subterranean Secret", aired on March 14, 2022.

British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.

  • Documentary

Last updated

Episodes

20 episodes · 2 seasons

Season 1

2019 · 10 episodes · Last episode: 6 years ago

Underground Worlds Season 1 release dates →
  1. E10

    10. Dover War Rooms

    Finale

    This edition explores the military headquarters built beneath Dover Castle during the Second World War, and Odessa's catacombs, possibly the largest tunnel network in the world.

  2. E9

    9. Edinburgh Vaults

    The sinister history of Edinburgh's vaults and the development of Helsinki's subterranean spaces. Plus, the impact of the building of Naples on the volcanic ground below.

  3. E8

    8. The Maginot Line

    The secrets of the largest subterranean fortress along France's border with Germany, and a look at how a unique precious mineral was discovered in Derbyshire.

  4. E7

    7. Jersey War Tunnels

    The underground bases built by the German army during the occupation of Jersey, and a group of more than 20 underground cities in Turkey, one of which dates back to 800BC.

  5. E6

    6. City of Naours

    An underground city beneath a forest in Northern France built to house 3,000 people, an ice cave under Iceland's biggest glacier, and a subterranean power station in London.

  6. E5

    5. Bouzincourt

    A labyrinth of tunnels underneath a tiny French village which contains mysteries from several historical eras, and a Welsh slate mine that has been given a new lease of life.

  7. E4

    4. Kingdom of Salt

    The Wieliczka Salt mine in Poland, some 327 meters deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.

  8. E3

    3. Switzerland

    A look at some of Switzerland's 300,000 subterranean bunkers, the creation of a local entrepreneur shrouded in mystery in England and a network of tunnels deep beneath Slovenia.

  9. E2

    2. Sweden

    Explores how Sweden has gone to extraordinary lengths to protect itself - by excavating 65,000 nuclear bunkers. Plus, Somerset's Cheddar Gorge and an underground first in Romania.

  10. E1

    1. Gibraltar

    This edition explores the hidden network of tunnels and caves beneath Gibraltar that were instrumental to the Allies success during WWII. Plus, the ultimate super-sewer beneath London and a breathtaking cave system in Postojna, Slovenia.

Season 2

2022 · 10 episodes · Last episode: 4 years ago

Underground Worlds Season 2 release dates →
  1. E10

    10. Italy's Subterranean Secret

    Finale

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

  2. E9

    9. Subterranean Silo Survival

    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.

  3. E8

    8. Buried Lab of the Black Hills

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

  4. E7

    7. Medieval Maze of Secrets

    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.

  5. E6

    6. Ireland's Underground Alcatraz

    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.

  6. E5

    5. Mystery of the Kentucky Cave

    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.

  7. E4

    4. Hotel Bunker of the Apocalypse

    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.

  8. E3

    3. Cincinnati's Secret Caverns

    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.

  9. E2

    2. Grand Canyon's Lost Treasure

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

  10. E1

    1. Murder Raid Tunnels

    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.

Underground Worlds FAQ

When is the next episode of Underground Worlds?

A date for the next episode of Underground Worlds hasn't been announced yet. Follow Underground Worlds in the Streambay app and you'll be notified as soon as a new episode airs.

When did the latest episode of Underground Worlds come out?

The most recent episode of Underground Worlds, Season 2 Episode 10 "Italy's Subterranean Secret", aired on March 14, 2022.

How many seasons of Underground Worlds are there?

Underground Worlds has 2 seasons with 20 episodes in total.

When did Underground Worlds first air?

Underground Worlds first aired on U&Yesterday on September 25, 2019.

How do I get notified when new episodes of Underground Worlds are released?

Download the Streambay app, follow Underground Worlds, and you'll get a push notification the moment each new episode is released.

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