The USS Virginia-class submarines are the United State's newest and most advanced submarine. The first Virginia slipped beneath the waves just eight years ago and  only nine vessels have been completed.
They take more than five years to build and run about $2.4 billion apiece.
Here, we look at the Virginia class of submarines from stern to bow, finding out what makes these ships unique.
We'll start in the engine room, move our way over the reactor, through the barracks to the command center and down into the torpedo room.