Watch Secret Weapon of the Confederacy

During the American Civil War, the Union maintained a blockade at the Charleston, South Carolina harbor. This film recounts the Confederacy’s attempt to break the stronghold with the H.L. Hunley, a submarine. The documentary goes through the events of February 17, 1864 as the Hunley's eight-man crew approached their proposed target, the U.S.S. Housatonic. It would be the first time a submarine would destroy a warship. Historians and experts weigh in on the significance of this little-known chapter in the Civil War and the fate of the Hunley’s crew, who never returned from their mission.