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Paul Mardikian, senior conservator on the project to conserve the Confederate submarine H.L. Hunley, discusses removing a steel truss that had surrounded sub on Thursday, Jan. 12, 2012 at a conservation lab in North Charleston, S.C. Scientists say removing the truss allows the first clear view of the sub since it sank in 1864 off the South Carolina coast. (AP Photo/Bruce Smith)

Sunken Civil War sub reveals new clues

Scientists say a pole on the front of the Confederate submarine H.L. Hunley designed to plant explosives on enemy ships may hold a key clue to its sinking during the Civil War.