This is probably one of the best stories of the Cold War. A sunken Soviet missile sub that may have been hijacked, a possible rogue missile launch against Pearl Harbor, and the Navy and CIA scrambling to find and recover the sub. Oh and there's an eccentric billionaire. I don't know if it gets any better especially since it seems to be mostly true. :-) Here are some links with a fair amount of reading and some good illustrations of the unusual and classified hardware involved in this story.

The Amazing Story of the K-129 [1]  large page on the sinking and recovery

Russian K-129 description [2] wikipedia.org entry