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The Confederate submarine H.L. Hunley sits in a conservation tank after a steel truss that had surrounded it was removed on Thursday, Jan. 12, 2012 at a conservation lab in North Charleston, S.C. The crank that Confederate sailors turned to propel the sub is visible at top left. Scientists say removing the truss allows the first clear view of the sub since it sank in 1864 off the South Carolina coast. (AP Photo/Bruce Smith)

The Confederate submarine H.L. Hunley sits in a conservation tank after a steel truss that had surrounded it was removed on Thursday, Jan. 12, 2012 at a conservation lab in North Charleston, S.C. The crank that Confederate sailors turned to propel the sub is visible at top left. Scientists say removing the truss allows the first clear view of the sub since it sank in 1864 off the South Carolina coast. (AP Photo/Bruce Smith)

Sunken Civil War sub reveals new clues

January 12, 2012

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.