K-84 Ekaterinburg (Russian: К-84 Екатеринбург) is a Project 667BDRM Delfin-class (NATO reporting name: Delta IV) nuclear-powered ballistic missile submarine.

[1][2] Construction of the nuclear submarine Ekaterinburg (K-84) began at the Northern Machinebuilding Enterprise (Sevmash) in Severodvinsk on 17 February 1982, before being commissioned into the Soviet Navy on 30 December 1985.

[1][3] Each Shtil missile carries ten 100 kt multiple independently targeted reentry vehicles, and has a circular error probable of 500 metres (1,600 ft).

[4] It is also equipped with RPK-7 Veter (NATO designation: SS-N-16 Stallion) anti-ship missiles for use against large surface vessels, and self-defense torpedoes.

[8] Initial statements from Russian authorities indicate there were no injuries or radiation leakage, and that the vessel was not carrying any weapons as it was drydocked for repairs.

[citation needed] Some sources speculated that the submarine's pressure hull suffered possible structural damage due to the intense heat; the temperature inside the torpedo room allegedly rose to 60-70 °C.

[12] According to Vlast, the presence of nuclear weapons on the burning vessel would have meant that “Russia, for a day, was on the brink of the biggest catastrophe since the time of Chernobyl.”[12] However, according to Russia's Deputy Prime Minister Dmitry Rogozin, the nuclear weapons had not been unloaded before the repair work started.