K-51 Verkhoturye (Russian: К-51 Верхотурье) is the lead submarine of the Project 667BDRM Delfin class (NATO reporting name: Delta IV) nuclear-powered ballistic missile submarines currently in service with the Russian Navy.

[2][3][4] Two VM-4 180 MW (240,000 hp) pressurized water reactors power the submarine, and drive two shafts with seven-bladed fixed-pitch propellers.

[2][3] The boat's primary armament are the 16 R-29RM Shtil submarine-launched ballistic missiles which have the range of 8,300 km (5,200 mi).

It also has four 533 mm bow tubes which can launch RPK-7 Veter anti-ship cruise missiles, and up to 12-18 torpedoes or 24 mines.

[1] The boat's keel was laid on 23 February 1981, it was launched on 7 March 1984 and was commissioned on 28 December 1984 into the Soviet Navy.