The history of the Confederate submarine H. L. Hunley is as astonishing as its disappearance. On February 17, 1864, after a legendary encounter with a Union battleship, the iron "fish boat" vanished without a trace somewhere off the coast of South Carolina. For more than a century the fate of the Hunley remained one of the great unsolved mysteries of the Civil War. Then, on August 8, 2000, with thousands of spectators crowding Charleston...