(1823-1863) Plaque in his honor, erected at the Submarine Library, Groton, Connecticut, by the United Daughters of the Confederacy, 1960. He was one of the designers of the Confederate submarine H.L. Hunley (1863-1864) and lost his life in her on 15 October 1863. The 1828 birth date given on the plaque is incorrect. Courtesy of the Electric Boat Company, Groton, CT. U.S. Naval History and Heritage Command Photograph.