Don Wildman travels to the farthest and deepest reaches of the globe, using cutting-edge technology to explore mysteries buried deep underground.
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| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Scotland's Sin City | 2007-04-23 | 60 min |
| Season 1 | Episode 2 | Hitler's Underground Lair | 2007-04-30 | 60 min |
| Season 1 | Episode 3 | Rome's Hidden Empire | 2007-05-07 | 60 min |
| Season 1 | Episode 4 | Catacombs of Death | 2007-05-14 | 60 min |
| Season 1 | Episode 5 | City of Caves: Budapest, Hungary | 2007-05-21 | 60 min |
| Season 1 | Episode 6 | New York | 2007-06-04 | 60 min |
| Season 1 | Episode 7 | London's Lost Cities: London, England | 2007-06-11 | 60 min |
| Season 1 | Episode 8 | Beneath Vesuvius | 2007-06-18 | 60 min |
| Season 1 | Episode 9 | Freemason Underground | 2007-06-25 | 60 min |
| Season 1 | Episode 10 | Dracula's Underground: Bucharest, Romania | 2007-07-09 | 60 min |
| Season 1 | Episode 11 | Secret Pagan Underground | 2007-07-16 | 60 min |
| Season 1 | Episode 12 | Underground Bootleggers | 2007-07-23 | 60 min |
| Season 1 | Episode 13 | Rome: The Rise | 2007-07-30 | 60 min |
| Season 2 | Episode 1 | Underground Apocalypse | 2008-01-28 | 60 min |
| Season 2 | Episode 2 | Vietnam | 2008-02-04 | 60 min |
| Season 2 | Episode 3 | A-Bomb Underground | 2008-02-11 | 60 min |
| Season 2 | Episode 4 | Viking Underground | 2008-02-25 | 60 min |
| Season 2 | Episode 5 | Hitler's Last Secret | 2008-03-03 | 60 min |
| Season 2 | Episode 6 | Maya Underground | 2008-03-10 | 60 min |
| Season 2 | Episode 7 | Mob Underground | 2008-03-17 | 60 min |
| Season 2 | Episode 8 | Prophecies from Below | 2008-03-24 | 60 min |
| Season 2 | Episode 9 | New York: Secret Societies | 2008-03-31 | 60 min |
| Season 2 | Episode 10 | Washington D.C.: Seat of Power | 2008-04-15 | 60 min |
| Season 2 | Episode 11 | Stalin's Secret Lair | 2008-04-22 | 60 min |
| Season 2 | Episode 12 | Katrina Underground | 2008-04-29 | 60 min |
| Season 2 | Episode 13 | Secret Soviet Bases | 2008-05-05 | 60 min |
| Season 3 | Episode 1 | City of Blood: London, England | 2008-10-26 | 60 min |
| Season 3 | Episode 2 | Okinawa: Tunnels of Hell | 2008-11-02 | 60 min |
| Season 3 | Episode 3 | Real Mafia Underground | 2008-11-09 | 60 min |
| Season 3 | Episode 4 | Secret Sin City: Las Vegas, USA | 2008-11-16 | 60 min |
| Season 3 | Episode 5 | Hitler's Trenches | 2008-11-23 | 60 min |
| Season 3 | Episode 6 | Barbarian's Lair | 2008-12-01 | 60 min |
| Season 3 | Episode 7 | Land of Manson | 2008-12-07 | 60 min |
| Season 3 | Episode 8 | Gladiators: Blood Sport | 2008-12-15 | 60 min |
| Season 3 | Episode 9 | Secret Holy Land | 2008-12-22 | 60 min |
| Season 3 | Episode 10 | Under the Rock | 2009-01-12 | 60 min |
| Season 3 | Episode 11 | Tomb of the Lost Mummies | 2009-01-26 | 60 min |
| Season 3 | Episode 12 | Gods of War | 2009-02-02 | 60 min |
| Season 3 | Episode 13 | Alcatraz Down Under: Sydney, Australia | 2009-02-09 | 60 min |
| Season 4 | Episode 1 | Mayan Apocalypse | 2021-09-07 | 60 min |
| Season 4 | Episode 2 | America's Military Underground | 2021-09-14 | 60 min |
| Season 4 | Episode 3 | Murder Tunnels | 2021-09-21 | 60 min |
| Season 4 | Episode 4 | America's Ancient Ancestors | 2021-09-28 | 60 min |
| Season 4 | Episode 5 | The Pirate Queen's Lair | 2021-10-05 | 60 min |
| Season 4 | Episode 6 | Templars And The Founding Fathers | 2021-10-12 | 60 min |
| Season 4 | Episode 7 | Secrets of the Ancient Metropolis | 2021-10-19 | 60 min |
| Season 4 | Episode 8 | The Lost Aztec Colony | 2021-10-26 | 60 min |
