Series synopsis
Underground Worlds is a British documentary television series that premiered on U&Yesterday on September 25, 2019.
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
Premise
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
Episodes
This series spans 2 seasons with 20 episodes.
| Season | Episodes | First aired | Last aired |
|---|---|---|---|
| Season 1 | 10 | September 25, 2019 | November 27, 2019 |
| Season 2 | 10 | January 10, 2022 | March 14, 2022 |
| Episode | Title | Air date |
|---|---|---|
| 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. |
September 25, 2019 |
| 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. |
October 2, 2019 |
| 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. |
October 9, 2019 |
| Episode | Title | Air date |
|---|---|---|
| 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. |
January 10, 2022 |
| 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. |
January 17, 2022 |
| 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. |
January 24, 2022 |
Production
Release
| Original network/platform | U&Yesterday |
|---|---|
| First aired | September 25, 2019 |
| Last aired | March 14, 2022 |
| Runtime | 45 minutes |
| Status | continue |