A diagram showing the design of a torpedo attached to the spar 

A diagram showing the design of a torpedo attached to the spar in front of the Confederate submarine H.L. Hunley is seen in North Charleston, S.C., on Monday Jan. 28, 2013. Scientists say they have found remnants of the torpedo casing on the spar indicating the Hunley 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
A diagram showing the design of a torpedo attached to the spar in front of the Confederate submarine H.L. Hunley is seen in North Charleston, S.C., on Monday Jan. 28, 2013. Scientists say they have found remnants of the torpedo casing on the spar indicating the Hunley 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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