Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
You can now watch Underground Marvels online on the following streaming providers in the United States.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Secrets of the Rock | 2019-10-17 | 60 min |
| Season 1 | Episode 2 | Mystery of the Lost Labyrinth | 2019-10-24 | 60 min |
| Season 1 | Episode 3 | Secrets of the Terror Tunnels | 2019-10-31 | 60 min |
| Season 1 | Episode 4 | The Renegade's Lair | 2019-11-07 | 60 min |
| Season 1 | Episode 5 | Cave of the Body Snatchers | 2019-11-14 | 60 min |
| Season 1 | Episode 6 | World's Biggest Labyrinth | 2019-11-21 | 60 min |
| Season 1 | Episode 7 | Treasures of the Lost Mine | 2019-12-05 | 60 min |
| Season 1 | Episode 8 | Ghosts of the Hell Maze | 2019-12-12 | 60 min |
| Season 1 | Episode 9 | Conspiracy in the Buried City | 2019-12-19 | 60 min |
| Season 1 | Episode 10 | Curse of Cannibal Caves | 2019-12-26 | 60 min |
| Season 2 | Episode 1 | Hotel Bunker of the Apocalypse | 2021-08-05 | 60 min |
| Season 2 | Episode 2 | Mystery of the Kentucky Cave | 2021-08-12 | 60 min |
| Season 2 | Episode 3 | Cincinnati's Secret Caverns | 2021-08-19 | 60 min |
| Season 2 | Episode 4 | Buried Lab of the Black Hills | 2021-08-26 | 60 min |
| Season 2 | Episode 5 | Ireland's Underground Alcatraz | 2021-09-02 | 60 min |
| Season 2 | Episode 6 | Subterranean Silo Survival | 2021-09-09 | 60 min |
| Season 2 | Episode 7 | Italy's Subterranean Secret | 2021-09-16 | 60 min |
| Season 2 | Episode 8 | Grand Canyon's Lost Treasure | 2021-09-23 | 60 min |
| Season 2 | Episode 9 | Murder Raid Tunnels | 2021-09-30 | 60 min |
| Season 2 | Episode 10 | Medieval Maze of Secrets | 2021-10-07 | 60 min |