Russian nuclear submarine K-407 Novomoskovsk. Watercolor by Joan Mañé

K-407 Novomoskovsk is a Project 667BDRM Delfin-class ballistic missile submarine (NATO reporting name Delta IV) of the Russian Navy’s Northern Fleet.

Construction of the nuclear submarine K-407 Novomoskovsk began at the Northern Machine building Enterprise (Sevmash) in Severodvinsk on 2 February 1987, and it became part of the Soviet Navy on 27 November 1990. She was the last of seven 667BDRM Delfin submarines and the last SSBN submarine built in the USSR. This class of submarines was developed at the Rubin Design Bureau in 1975 and is considered one of the most successful Soviet submarine missile carrier designs.

The submarine has a submerged displacement of 18,200 tons and a surface displacement of 11,700 tons. It is 167 m (547 ft 11 in) long and 11.7 m (38 ft 5 in) wide. It is powered by two nuclear reactors with a total power of 180 MW (240,000 hp).

The submarine’s immersion depth is 400 m (1,300 ft); its surface speed is 14 knots (26 km/h; 16 mph), and its underwater speed is 24 knots (44 km/h; 28 mph).

It carries a crew of 135. Armaments include a D-9RM missile system (16 RSM-54 ballistic missiles) and four 533 mm (21.0 in) torpedo tubes.

The RSM-54 missile (3M37, R-29RM, or SS-N-23 according to the NATO classification) is a liquid-propellant, three-stage missile with separable heads (it carries four or ten warheads depending on the modification). It has a range of 8,300 km (5,200 mi), a CEP of 500 m (1,600 ft), and a launching mass of 40.3 tons. It is 14.8 m (48 ft 7 in) long and 1.9 m (6 ft 3 in) in diameter.

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