Russia's Sevmash shipyard is simultaneously building four nuclear-powered submarines for the first time in the country's modern history.

Four of the most advanced nuclear-powered submarines in the world are now simultaneously under construction at Russia's Sevmash shipyard for the first time in the country's modern history, Russia media reported.

"Sevmash finished 2014 with good results, completely fulfilling the planned volume of the state defense order. Also in 2014, four fourth-generation nuclear submarines have been laid down at the stocks of the shipyard," Sevmash spokesman Marat Abizhanov said.

Last year, the company constructed and transferred two Yasen- and Borei-class nuclear-powered submarines, the Severodvinsk and the Vladimir Monomakh, which were then delivered to the Russian Navy.

This year, Sevmash is constructing Yasen-M- and Borei-A-class nuclear-powered submarines, the Kazan and the Prince Vladimir, as well as the multipurpose nuclear submarine Novosibirsk and the nuclear submarine Prince Oleg.

Founded in 1939, Sevmash is based in the northern Russian city of Severodvinsk, and remains the only Russian shipyard to build atomic submarines for the Russian Navy.