The Confederate submarine H.L. Hunley sits in a conservation tank after a steel truss that had surrounded it was removed in this Jan. 12, 2012 file photo taken at a conservation lab in North Charleston, S.C. 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 the North Charleston lab where the hand-cranked sub is being preserved and studied. (AP Photo/Bruce Smith, File)

The Confederate submarine H.L. Hunley sits in a conservation tank after a steel truss that had surrounded it was removed in this Jan. 12, 2012 file photo taken at a conservation lab in North Charleston, S.C. 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 the North Charleston lab where the hand-cranked sub is being preserved and studied. (AP Photo/Bruce Smith, File)

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