That was a Diesel Boat, but not a Fleet Boat. That would have been Barbel (SS-580). She was stricken on January 17, 1990 and sold in the early 90's to Southwest Recycling at Terminal Island, the same firm that scrapped Bon Homme Richard (CVA-31) and Chicago (CG-11). They went bankrupt after starting on Barbel and she was left there for about 9 years with no sail. She was used in the movie Crimson Tide as a mockup of the Alabama (with a wooden conning tower and deck) and eventually sunk as a target on January 30, 2001.
http://www.navsource.org/archives/08/08580b.htmScroll down to the last two pictures to see what I'm talking about.
Roncador was sold on October 21, 1982 to National Metal & Steel of Terminal Island btw.