I'd like to recommend you to read Junio Valerio Borghese's "Decima Flottiglia MAS" book. Probably, it's not quite that you've expected, but you will definitely like it. It's about Italian naval frogmen commando training and operations in the Mediterranean sea during WW2. Very live, detailed, realistic, but a bit embellished, as some experts consider.
That's one of my personal top-list.
