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Season 4 Episode
- Season 2 Underground Apocalypse
- Season 2 Vietnam
- Season 2 A-Bomb Underground
- Season 2 Viking Underground
- Season 2 Hitler's Last Secret
- Season 2 Maya Underground
- Season 2 Mob Underground
- Season 2 Prophecies From Below
- Season 2 New York: Secret Societies
- Season 2 Washington D.C.: Seat of Power
- Season 2 Stalin's Secret Lair
- Season 2 Katrina Underground
- Season 2 Secret Soviet Bases
Cities of the Underworld - Season 2
8.20 43 minutes Don Wildman travels to the farthest and deepest reaches of the globe, using cutting-edge technology to explore mysteries buried deep underground.
