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Explorer Bob Ballard plunges deep into the final frontier in a documentary that plunges to the deepest depths of the ocean to uncover the secrets of the past, and find out just what the planet might have in store for humankind in the future. Join Ballard as he turns back the clock to investigate the 1864 submarine attack on the Union warship Housatonic, and follow adventurer Clive Cussler as his determined crew seeks out the ship that initiated the attack and brings it to dry dock in South Carolina for a closer look.