All 12 episodes of the American documentary series following the exploits of the Odyssey Marine Exploration crew, who scour the bottom of the sea looking for lost sunken ships in the hope of finding valuable treasure. Episodes are: 'The Merchant Royal', 'Pirates!', 'The Legend', 'Return to the Legend', 'Turning Lead Into Gold', 'U-Boats', 'Lusitania Revealed', 'Malta', 'A Voyage Interrupted: The Liberty Ship', 'Mysterious Cargo', 'The Silver Queen' and 'Battle for the Black Swan'.