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 ... more 
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. Monday, Feb. 17, 2014, is the 150th anniversary of the attack in which the Hunley sank the Union blockade ship Housatonic off Charleston, S.C., during the Civil War becoming the first submarine in history to sink an enemy warship. (AP Photo/Bruce Smith, File) less 
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Associated Press | Photo By Bruce Smith, File
Mon, Feb 17, 2014 9:03 AM EST