Here's a fascinating article on the top secret NR-1 submarine.

In the Navy's "silent service," every submarine operates in secrecy, but Rickover protected his NR-1 in particular by sharing details of its development and capabilities on a need-to-know basis. The cloak was pulled back by publicity of exploits including a 1976 mission to recover an F-14 fighter with a newly developed missile that had rolled off the deck of an aircraft carrier.