Admiralty Shipyards JSC commenced sea trials of Project 677 Kronshtadt submarine.

According to information published by the Russian press agency TASS on December 29, 2021, the Russian Admiralty Wharves Shipyard has completed the first stage of shipbuilders sea trials of the Project 677 diesel-electric submarine Kronstadt (NATO reporting name: Lada-class), the shipyard’s press office said.
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Project 677 subsurface ships are the fourth generation of non-atomic submarines (Picture source: Admiralty Shipyards JSC)

“The Admiralty Wharves Shipyard has concluded the first stage of the shipbuilder's sea trials of the Project 677 submarine Kronstadt,” the press office said. The Admiralty Wharves Shipyard is the sole producer of submarines of the type.

During the first stage of the trials, the submarine’s speed and maneuverability tests were carried out. The shipbuilders and the crewmen also conducted trim dive and inclining tests, checked the sonar system, navigation and communication equipment, tested the mast-hoisting gear.

The Admiralty Wharves Shipyard has been building the Kronstadt submarine under the adjusted design based on the results of the operational evaluation of the lead sub. The submarine’s onboard equipment control, propulsion, and navigation systems have been modernized.

Project 677 Lada-class submarines are fourth-generation diesel-electric subs. Today, they are considered to be the most advanced and promising diesel-electric submarines in terms of their combat effectiveness and other tactical capabilities.

Project 677 submarine Kronstadt (Picture source: Admiralty Shipyards JSC)

The Project 677 Lada is a fourth-generation diesel-electric submarine designed by the Russian Rubin Design Bureau. In June 2017, the Russian Navy announced it plans to order two Lada-class submarines, and the building contract was signed in June 2019, during the International Military-Technical Forum «ARMY-2019». On 20 September 2018, the first serial submarine of the class, B-858 Kronshtadt, was launched at the Admiralty Shipyards in St. Petersburg.

One more submarine was ordered in August 2020, during the International Military-Technical Forum Army-2020.

The Project 677 Lada has a length of 72 m, a beam of 7.1 m, a draught of 6.5 m, and a maximum displacement of 2,700 tons. The submarine is powered by an electric propulsion motor driving one shaft. It can reach a maximum submerged speed of 21 knots (29 km/h) with a maximum cruising range of 7,500 nautical miles (13,800 km). It has an endurance of 45 days with a crew of 35 people.

The Project 677 Lada is equipped with six 533 mm (21 inches) torpedo tubes and carries 18 torpedoes or SSMs (Surface-to-Surface Missiles) or 44 mines. It also has 10 Kalibr / Club land-attack cruise missiles, anti-ship missiles, and anti-submarine missiles (some versions) RPK-6/SS-N-16 Vodopad/Stallion

Here, our analysis on  Lada-class diesel-electric submarine of project 677 for the Russian Navy, part 1 and part 2.

Project 677 submarine Kronstadt (Picture source: Admiralty Shipyards JSC)

Project 677 submarine Kronstadt (Picture source: Admiralty Shipyards JSC)