The Russian Typhoons are the largest class of submarine ever built. This is a type of nuclear-powered ballistic missile submarine deployed by the Soviet Navy in the 1980s. With over than 170 meters (515 feet) long and 23 meter (70 feet) wide. It can carry 20 ballistic nuclear missiles. They are quieter than their predecessors, largely due to their enormous size and improvements in quieting techniques. Despite their size, they are also more maneuverable than their immediate predecessors.

The Typhoons are the largest class of submarine ever built and when submerged for months, it is large enough to accommodate decent living facilities for the crew. The source of it's name is often claimed to be related to the use of the word "Typhoon" by Leonid Brezhnev. He coined this name as a reaction to the US Navy Ohio-class submarines in his 1974 speech while describing a new type of nuclear ballistic missile submarine.

Image source: Bellona Foundation

The Typhoon class submarines features six torpedo tubes besides their missile armament. All of the Typhoon class submarines are designed to handle RPK-2 (SS-N-15) missiles or Type 53 torpedoes. A Typhoon-class submarine can stay submerged for more than 120 days in case of emergency otherwise periods upto 120 days is normal. 20 R-39 (NATO: SS-N-20) ballistic missiles (SLBM) with a maximum of 10 MIRV nuclear warheads each is the composition of its primary weapon system. Technically, Typhoons were able to deploy their long-range nuclear missiles. They are moored at their docks. In March 2012, the Russian Navy canceled its Typhoon modernization program. The reason given is that modernizing one Typhoon would be as expensive as building two new Borei-class submarines. The remaining Typhoons have reached the end of service with the announcement that Russia has eliminated the last SS-N-20 Sturgeon SLBMs in September 2012.

In terms of Typhoons Figures, the data in very interesting. Here it is...

Length: Approx. 574 ft (175 m)
Beam: 75 ft (23 m)
Draft: 38 ft (12 m)
Displacement: 48,000 tons
Propulsion: 2 pressurized-water nuclear reactors, 2 propellers
Crew: 150
Armament: 6 torpedo tubes, 20 ballistic missiles
First Sub Commissioned: December 12, 1981
Maximum Speed: Approx. 27 knots (31 mph/50 kph)

There were several units of the Typhoons namely: TK-208 Dmitriy Donskoy, TK-202, TK-12,Simbirsk, TK-13, TK-17 Arkhangelsk, TK-20 Severstal and TK-210.