ST. PETERSBURG, May 5. /TASS /. The sixth Project 636.3 diesel-electric submarine Kolpino designed for the Russian Black Sea Fleet will be put afloat in St. Petersburg on May 31, a source in the Navy Main Command told TASS on Thursday.
"The submarine Kolpino is set to be floated out on May 31," the source said.
Russia’s United Ship-Building Corporation told TASS earlier that the submarine is expected to be put afloat in May. However, the corporation did not specify the exact date.
In all, the Russian Black Sea Fleet is expected to receive six Project 636.3 (Varshavyanka-class) diesel-electric submarines. The submarines developed by the Rubin Design Bureau are under construction at the Admiralty Wharves Shipyard in St. Petersburg.
The fifth Project 636.3 submarine Veliky Novgorod designed for the Black Sea Fleet was floated out on March 18. Both Kolpino and Veliky Novgorod submarines will be delivered to the Russian Navy before the end of 2016.
As of today, the Russian Navy operates four Project 636.3 submarines, the Novorossiysk, the Rostov-on-Don, the Stary Oskol and the Krasnodar.
In late 2015, the submarine Rostov-on-Don launched Kalibr cruise missiles from the Mediterranean Sea to destroy facilities of the Islamic State terrorist organization in Syria.