What is the Navy's fastest submarine?

Well to answer your question there are TWO US Navy Submarine Classes that have "PUBLISHED" maximum speeds of 25+ knots (Approx 28 mph) notice I said published, they will not divulge maximums of any of their equip. These two CLASSES ARE THE VIRGINA CLASS AND THE SEAWOLF CLASS... Listed Below.... If you look further down you will see an small article about a Russian Sub that had top speeds of 78+ knots. General Characteristics, VIRGINA CLASS Builder: General Dynamics Electric Boat Division and Northrop Grumman Newport News Date Deployed: Commissioned 23 October 2004 Propulsion: One nuclear reactor, one shaft Length: 377 feet (114.8 meters) Beam: 34 feet (10.4 meters) Displacement: Approximately 7,800 tons (7,925 metric tons) submerged Speed: 25+ knots (28+ miles per hour, 46.3+ kph) Crew: 134: 14 Officers; 120 Enlisted Armament: Tomahawk missiles, twelve VLS tubes, MK-48 ADCAP torpedoes, four torpedo tubes. Ships: USS Virginia (SSN 774), Groton, Conn. USS Texas (SSN 775), Groton, Conn. ...  more