13 Episodes

Season 2

Episodes

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  • 13 episodes
    13 episodes
    • s2e13Secret Soviet Bases
      May 5, 2008
    • s2e12Katrina Underground
      April 28, 2008
    • s2e11Stalin's Secret Lair
      April 21, 2008
    • s2e10Washington, D.C.: Seat of Power
      April 14, 2008
    • s2e9New York: Secret Societies
      March 31, 2008
    • s2e8Prophecies From Below
      March 24, 2008
    • s2e7Mob Underground
      March 17, 2008
    • s2e6Maya Underground
      March 10, 2008
    • s2e5Hitler's Last Secret
      March 3, 2008
    • s2e4Viking Underground
      February 25, 2008
    • s2e3A-Bomb Underground
      February 11, 2008
    • s2e2Vietnam
      February 4, 2008
    • s2e1Underground Apocalypse
      January 28, 2008