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Conservator Liisa Nasanen uses tools to remove encrustation from the hull of the Confederate submarine H.L. Hunley at the Warren Lasch Conservation Center in North Charleston, S.C., on Tuesday, August 12, 2014. After the submarine sat in a chemical bath for more than three months to help loosen the encrustation, scientists on Tuesday began the laborious job of removing the built-up sediment by hand. The work is expected to take between eight months and a year and scientists hope that when the hull is revealed, it will provide the final clues as to why the hand-cranked sub, the first in history to sink an enemy warship, sank off South Carolina in 1864. (Photo by Bruce Smith/AP Photo)
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