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In what was one of the more remarkable battles of the Civil War, in 1864 the Confederate army launched a primitive submarine, the C.S.S. H.L. Hunley, which attacked and sank a Union ship in Charleston Harbor off the coast of South Carolina. The Hunley was damaged severely in the battle and sank to the bottom of the ocean. About 130 years later, a team of researchers set out to find the Hunley and raise its remains to the surface. National Geographic Video: Raising the Hunley -- The Resurrection of a Civil War Legend is a documentary which looks at the history of this pioneering fighting ship and the effort that went into recovering it from the sea.