The Story of Valerio Borghese and the elite units of The Decima Mas
All i can say is those Italian boys had some big brass klankers to pull of what they did in WW2. The Italians were absolute pioneers of underwater combat missions in the war and caused the allies big headaches until they captured some of the teams and started to figure out what the hell these guys were up to.
this book is a must read if you like WW2 history and espically for the combat diving history.