The BSF Commander emphasized that successful underwater launch of cruise missiles Caliber made "our partners wake up".
Currently, the Black Sea Fleet operates two Improved Kilo-class subs – the lead one Novorossiysk and the first serial Rostov-on-Don which performed combat fire upon terrorist facilities in Syria in December 2015. Other two submarines, Stary Oskol and Krasnodar, have been already commissioned but not deployed in the Black Sea yet.
Project 636.3 diesel electric submarines (dubbed 'black holes' in the West for their high speed and silence) are designed for destruction of hostile subs and ships, defense of naval bases, coastal and sea infrastructure, reconnaissance and patrol activities on enemy’s sea lanes.
Surface displacement of these subs makes 2,350 tons, underwater displacement is 3,950 tons, maximum length is 73 meters, maximum hull beam is 10 meters, mean draft is 6.2 meters, surface speed is 17 knots, submerged speed is 20 knots, operating depth is 240 meters, maximum depth is 350 meters, crew is 52 persons, endurance is 45 days, submerged endurance at cruising speed is 400 nautical miles.
The submarines are equipped with 6 x 533-mm automatically loaded bow torpedo tubes, mines, Caliber cruise missiles capable of underwater launch, MANPADS Strela-3 or Igla.