For centuries, people have built mind-blowing structures underground. This series reveals incredible feats of human endeavour and reveals what people have built, how they built it and why.
For centuries, people have built mind-blowing structures underground. This series reveals incredible feats of human endeavour and reveals what people have built, how they built it and why.
Suggest an edit
Seasons (2)
Season 1
25 Sep 2019 – 27 Nov 2019 · 10 episodes
1Gibraltar25 Sep 2019
2Sweden2 Oct 2019
3Switzerland9 Oct 2019
4Kingdom of Salt16 Oct 2019
5Bouzincourt23 Oct 2019
6City of Naours30 Oct 2019
7Jersey War Tunnels6 Nov 2019
8The Maginot Line13 Nov 2019
9Edinburgh Vaults19 Nov 2019
10Dover War Rooms27 Nov 2019
Season 2
10 Jan 2022 – 14 Mar 2022 · 10 episodes
1Murder Raid Tunnels10 Jan 2022
2Grand Canyon's Lost Treasure17 Jan 2022
3Cincinnati's Secret Caverns24 Jan 2022
4Hotel Bunker of the Apocalypse31 Jan 2022
5Mystery of the Kentucky Cave7 Feb 2022
6Ireland's Underground Alcatraz14 Feb 2022
7Medieval Maze of Secrets21 Feb 2022
8Buried Lab of the Black Hills28 Feb 2022
9Subterranean Silo Survival7 Mar 2022
10Italy's Subterranean Secret14 Mar 2022
Cast
Crew
Related shows
No related shows found for this sort.
Reviews
Sign in to continue
Favorites, watchlist, and recommendations need a free account. Sign in or register to use them.