The nuclear-powered sub Dimitry Donskoy has completed the second phase of its factory performance trials in the White Sea, the Sevmash plant’s press service told Interfax. The submarine has undergone modernization procedures at the Sevmash shipyard in Severodvinsk, Arkhangelsk region. The planned program of trials has been fully completed, it said.

The submarine was built at the Sevmash plant in 1982 and became the first Russian Typhoon submarine
Design Bureau Rubin (St Petersburg) developed third generation Typhoon (Akula) class submarine project 941. Sevmash built six Typhoons. The submarine has multi-hulled design, having two parallel main hulls, also called strong hulls, inside the light hull. Maximum diving depth is 400 m. Speed is 12 knots when surfaced and 27 knots when submerged. Typhoon is capable of spending 120 days at sea. The submarine is divided into 19 compartments and powered with two 190 megawatts nuclear reactors.