The Seawolf class is a class of nuclear-powered fast attack submarines in service with the United States Navy. The class was the intended successor to the Los Angeles class. Design work began in 1983. At one time, an intended fleet of 29 submarines was to be built over a ten-year period, later reduced to twelve submarines.
A Typhoon-class submarine on the surface in 1985. Soviet Typhoon-class ballistic missile submarine, with inset of a football field graphic to convey a sense of the enormous size of the vessel. The Typhoon class was developed under Project 941 as the Russian Akula class (Акула), meaning shark.
The Ohio-class boats, each displacing 18,750 tons submerged, are the third largest submarines in the world, behind the 48,000-ton Typhoon class and 24,000-ton Borei class of the Russian Navy. The Ohio class replaced the Benjamin Franklin- and Lafayette-class SSBNs. The Ohio class was named after the lead submarine of this class, USS Ohio.
Soviet submarine K-162 was the world's fastest submarine. The first submarine constructed with a titanium hull, she was the only vessel of the Soviet Union's Project 661 Anchar nuclear-powered attack submarine design. The boat is best known in the West by its NATO reporting name Papa class. K-162 was renamed K-222 in 1978.
Designed by St. Petersburg-based Malakhit Central Design Bureau, Kazan is the first of a series of improved Yasen-class submarines. Kazan started construction in 2009. Russia intends to build seven submarines in the class by 2023, according to Russian news agency Tass.