May I recommend the following reading, and remember to buy through the subsim amazon store
http://www.amazon.co.uk/CIAs-Greates...vert+Operation
http://www.amazon.co.uk/Project-Azor...roject+Azorian
and this link for a declassified albeit redacted article from the NSA archive
http://nsarchive.gwu.edu/nukevault/ebb305/doc01.pdf
It is a fascinating story and I'm hoping to get the DVD that accompanies the Project Azorian book.