The Confederate submarine H.L. Hunley was the first submarine to sink an enemy ship during wartime. On 17 February 1864, H.L. Hunley rammed her torpedo into the Union sloop-of-war Housatonic, sinking both ships off the entrance to Charleston Harbor. Housatonic lost two officers and three enlisted men. Hunley, however, sunk with all hands after the collision and was not seen again for 131 years.
In 2000, H.L. Hunley was discovered after a 14-year search. Learn more about the discovery and recovery of H.L. Hunley on the NHHC Underwater Archaeology site page.