Conservator Paul Mardikian shows a bolt, its threads still intact, used to attach the spar that was at the front of the Confederate submarine H.L. Hunley during the a news conference in North Charleston, S.C., on Monday Jan. 28, 2013. Scientists have found remnants of a torpedo casing on the spar, indicating the sub was no more than 20 feet from the Union blockade ship Housatonic when the Hunley sank it off South Carolina in 1864, becoming the first sub in history to sink an enemy warship. (AP Photo/Bruce Smith).

Associated Press
Conservator Paul Mardikian shows a bolt, its threads still intact, used to attach the spar that was at the front of the Confederate submarine H.L. Hunley during the a news conference in North Charleston, S.C., on Monday Jan. 28, 2013. Scientists have found remnants of a torpedo casing on the spar, indicating the sub was no more than 20 feet from the Union blockade ship Housatonic when the Hunley sank it off South Carolina in 1864, becoming the first sub in history to sink an enemy warship.  (AP Photo/Bruce Smith).
Conservator Paul Mardikian shows a bolt, its threads still intact, used to attach the spar that was at the front of the Confederate submarine H.L. Hunley during the a news conference in North Charleston, S.C., on Monday Jan. 28, 2013. Scientists have found remnants of a torpedo casing on the spar, indicating the sub was no more than 20 feet from the Union blockade ship Housatonic when the Hunley sank it off South Carolina in 1864, becoming the first sub in history to sink an enemy warship. (AP Photo/Bruce Smith).
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