Delta IV 7 boats

K-64 was a Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

n designation shared by the first Alfa Class Submarine and later by a Delta IV class submarine.

The K-64 Designation was first given to the first Alfa Class Submarine, laid down on June 2, 1968 and launched on April 22, 1969. In 1972, the submarine suffered a major reactor problem in the form of a leak of liquid metal coolant. The superheated metal solidified on contact with the colder outside air, freezing and damaging internal components of the reactor. She was removed from service and towed to Severodvinsk

Severodvinsk

Severodvinsk is a city in the north of Arkhangelsk Oblast, Russia, located in the delta of the Northern Dvina River, west of Arkhangelsk. Administratively, it is incorporated as a town of oblast significance . Municipally, it is incorporated as Severodvinsk Urban Okrug. The city was founded as...

. At the dockyard, the damage to the reactor was deemed too extensive for repair and the decision was made to salvage as much as they could. K-64 was split in half, its bow section (including control spaces) was taken to Leningrad and used for training new Soviet submariners.

The K-64 designation was again given to a Delta IV class submarine launched on February 2, 1986 as the fourth ship of its class, entered in service in the Russian Northern Fleet. The sub was laid down in December 1982 and was built at Sevmash

Sevmash

JSC PO Sevmash is a shipbuilding company based in Severodvinsk, a port city on Russia's White Sea. The name Sevmash is an abbreviation of Severnoye Mashinostroitelnoye Predpriyatie , i.e. "Northern Machine-Building Enterprise". Sevmash is the largest shipbuilding enterprise in Russia and today the...

plant in Severodvinsk. This ship is still in active service.