Underground Marvels
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
| Last Episode | |
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| Medieval Maze of Secrets A forgotten world of ancient underground passages and medieval engineering lies hidden beneath the town of Exeter, England; experts investigate and reveal how this ambitious tunnel system was the result of one of the deadliest epidemics in history. |
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| # | Title | Aired |
|---|---|---|
| 1 | Secrets of the Rock |
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| 2 | Mystery of the Lost Labyrinth |
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| 3 | Secrets of the Terror Tunnels |
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| 4 | The Renegade's Lair |
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| 8 | Treasures of the Lost Mine |
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| 9 | Conspiracy in the Buried City |
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