"Pioneer II" was probably the submarine described by a Confederate deserter on 26 February 1863 to the Senior Officer of the Federal Blockade off Mobile: "On or about the 14th, an infernal machine, consisting of a submarine boat, propelled by a screw which is turned by hand, capable of holding 5 persons, and having a torpedo which was to be attached to the bottom of a vessel and exploded by means of clockwork, left Fort Morgan at 8 p.m. in charge of a Frenchman who invented it. The intention was to come up at Sand Island, get the bearing and distance of the nearest vessel, dive under again and operate upon her; but on emerging they found themselves so far outside the island and in so strong a current (setting out) that they were forced to cut the torpedo adrift and make the best of their way back." She was second in a line of three submarines that included Pioneer and H.L. Hunley.

http://civilwarwiki.net/wiki/CSS_Pioneer_II