October 15, 1863 - The first successful submarine, the C.S.S Hunley, sinks during a test run in Charleston Harbor. The inventor, Horace Lawson Hunley, and seven crew members drowned. Surprisingly, another crew volunteered and the Hunley went back to work. In February 1864 it torpedoed a US ship outside Charleston Harbor. It was the first sub to ever sink a ship in battle. Unfortunately that was its only successful mission - it sank on its way back into Charleston Harbor, killing another crew.