Charleston Naval Base

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FILE - The Confederate submarine H.L. Hunley is raised from a barge by a crane at the former Charleston Naval Base in North Charleston, S.C., in this Aug. 8, 2000, file photo. 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/Paula Illingworth, File)