Great story if you ever get a chance to read it. The Bio I recommend is The Bravest Man by William Tuohy
O'Kane himself wrote a great book called Wahoo: The Patrols of America's Most Famous World War II Submarine
I remember a loooong time ago reading about the submarine offensive in the Pacific. I can't even remember the title of the book it's been that long. IIRC, Capt. Morton of the Wahoo used to allow his exec to conn the sub during the attack while he sat (probably visualizing the attack or estimating the attack numbers). Whatever the reason, he had more than one exec who went on to be an excellent commander in his own right.