With superb High-Definition visuals and fascinating stories of marine life, this 13-episode natural history series explores amazing undersea subjects including the giant octopus, venomous lionfish, sea lions, and 50-foot whale sharks. Set also includes the complete 39-episode series Undersea Explorer, featuring even more stunning footage of the mysterious Galapagos Islands, the majestic Great Barrier Reef and more. 42 episodes, 30 hrs, 6 DVDs.