A century and a half after it sank and a decade and a half after it was raised, scientists are finally getting a look at the hull of the Confederate submarine H.L. Hunley, the first sub in history to sink an enemy warship. What they find may finally solve the mystery of why the hand-cranked submarine sank during the Civil War. "It's like unwrapping a Christmas gift after 15 years. We have been wanting to do this for many years now," said Paul Mardikian, senior conservator on the Hunley project.