Scubaboard is a nifty scuba forum but I don't spend any time on there:
http://www.scubaboard.com/forums/matrix/
And if you haven't read this book:
You BETTER!!!
I coudn't put the thing down. True story of a German sub discovered off the Eastern Seaboard.
Oh, and I'm Advanced Open Water Certified, no more......yet....
Hey, has anyone dived the Andrea Doria??