US Navy
Naval Historical Center: The h.l. Hunley in Historical Context
An extensive history of the Confederate submarine, H.L.Hunley, the first submarine to sink a warship. Also information about two earlier prototypes.
US Navy
Naval Historical Center: H. L. Hunley, Confederate Submarine
This site provides a short article on the history of the first submarine to engage and sink a warship. Many links to information about its history, preservation and excavation. Includes original US and Confederate Navy documents.