Dark Transit

Lieutenant Anthony Pacino reports aboard the project boat USS Vermont two years after having survived the catastrophic sinking of the Piranha. Pacino quickly learns that Vermont's missions are all ultra-secret with the boat reporting only to the Sub Force commander, the National Security Advisor and the President: Vermont does the dirty deeds that need doing in deadly silence and obscurity.
After Vermont misses the mark on an easy mission, there are questions asked about her ability to conduct the next mission, one that is vital to the security of the United States and the future of the submarine force. Vermont is tasked with stealing a revolutionary submarine that the Russians are testing with an Iranian crew because it's too risky to use Russian sailors. It's a high-stakes gamble for all involved, with the losers vanishing if things go wrong, the winners validating a world-changing technology.
Pacino is part of the mission to steal the submarine, but the toughest obstacle is a wolf-pack of Russians coming to the defense of the Iranian submarine. Getting it back to the United States for evaluation becomes secondary to surviving an exchange of missiles and torpedoes in an underwater battle that threatens to let the final genie out of the bottle.