6 Episodes

Season 4

Episodes

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  • 6 episodes
    6 episodes
    • s4e6Ancient New York
      March 10, 2008
    • s4e5Ancient Chinese Super Ships
      March 3, 2008
    • s4e4Ancient Death Machines
      February 25, 2008
    • s4e3Ancient Super Ballistics
      February 11, 2008
    • s4e2Ancient Super Navies
      February 4, 2008
    • s4e1Mega-Structures of the Deep
      January 28, 2008