You guys should check out "The Deck Plate", naval warfare author Jeff Edwards' official website. He has a book out called "Torpedo!" with a sample chapter, about a hypothetical submarine attack set in modern times. I haven't read the book yet, but the chapter on their site is pretty good. I'm d/ling the PC game that accompanies the book right now. The game is free.
Website:
http://www.thedeckplate.com/index.htm
You can get the book through Amazon, Mysterious Galaxies, and Barnes and Noble.
Passing the info along as FYI.