The H.L. Hunley was the first submarine to sink a ship in wartime. It was built during the Civil War and actually sank twice before completely a mission successfully. On February 17, 1864 the Hunley sank the USS Housatonic off the Charleston Harbor. Unfortunately, the Hunley never made it back to shore nor was it ever seen again. The Hunley was found buried in the mud in 1995. It took several years and lots of work before the Hunley revealed its secrets. Scientists still don’t know exactly why the Hunley sank with all eight crewmen aboard. However, the crew have now been put to rest while the investigation into the Hunley continues.