Right now I am reading a book called Dead Wake: The Last Crossing of the Lusitania, by Eric Larson. It's the story of the sinking of the Lusitania in 1915 and of the German U-boat that sank her. In a section about the history of submarines, Larson talks about the Hunley.
"Dead Wake" is an excellent book. I recently read "Death in the Baltic" about Wilhelm Gustloff, the deadliest sea tragedy ever.
Read that book this spring. Wonderful book and very well researched.