Admiralty Shipyards launched the second Improved Kilo-class (Project 636) diesel-electric submarine (SSK), Rostov-na-Donu , for the Russian Navy on June 26.
The St Petersburg yard is building six Improved Kilo boats for the navy's Black Sea Fleet.
The first Improved Kilo, Novorossiysk , was launched in late November 2013, and is completing builders trials before delivery to the navy in 2014. It is expected to be commissioned in 2015.
The yard plans to roll out the third unit, Stary Oskol , in August 2014. Boat four, Krasnodar , was laid down in February. It is understood that Veliky Novgorod and Kolpino may be laid down later in 2014.