FILE - In this Aug. 3, 2010 file photo, the spar of the Confederate submarine H.L. Hunley is displayed at the conservation lab in North Charleston, S.C., where the submarine is being conserved. 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. The experts are to release their findings Monday Jan. 28, 2013 at a North Charleston lab where the hand-cranked sub is being preserved and studied. (AP Photo/Bruce Smith)

Associated Press
FILE - In this Aug. 3, 2010 file photo, the spar of the Confederate submarine H.L. Hunley is displayed at the conservation lab in North Charleston, S.C., where the submarine is being conserved. 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. The experts are to release their findings Monday Jan. 28, 2013 at a North Charleston lab where the hand-cranked sub is being preserved and studied.  (AP Photo/Bruce Smith)
FILE - In this Aug. 3, 2010 file photo, the spar of the Confederate submarine H.L. Hunley is displayed at the conservation lab in North Charleston, S.C., where the submarine is being conserved. 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. The experts are to release their findings Monday Jan. 28, 2013 at a North Charleston lab where the hand-cranked sub is being preserved and studied. (AP Photo/Bruce Smith)
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