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.
EP2 Grand Canyon's Lost TreasureJan 17, 2022
Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK.
EP3 Cincinnati's Secret CavernsJan 24, 2022
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.
EP4 Hotel Bunker of the ApocalypseJan 31, 2022
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.
EP5 Mystery of the Kentucky CaveFeb 07, 2022
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.
EP6 Ireland's Underground AlcatrazFeb 14, 2022
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.
EP7 Medieval Maze of SecretsFeb 21, 2022
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.
EP8 Buried Lab of the Black HillsFeb 28, 2022
Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark.
EP9 Subterranean Silo SurvivalMar 07, 2022
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.
EP10 Italy's Subterranean SecretMar 14, 2022
Exploring caves beneath Orvieto in Italy, originally built by the Etruscans long before the Roman Empire. Plus, a former limestone mine under Kansas City.
Official Website: https://yesterday.uktv.co.uk/shows/underground-worlds/
Synopsis
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.