Sankt-Petersburg (B-585), the lead ship in Project 677 Lada Class submarines was commissioned in May 2010. Credit: JSC 'Admiralty Shipyards'.
JSC Admiralty Shipyards signed a contract for the construction of the fourth and fifth submarines in June 2019. Credit: JSC 'Admiralty Shipyards'.
Kronstadt (B-586) was launched in September 2018. Credit: JSC 'Admiralty Shipyards'.

The Project 677 Lada Class diesel-electric submarines are being built by Admiralty Shipyard for the Russian Navy. The class is also called the Petersburg class after the lead submarine. The Lada Class succeeds the Kilo Class submarines.

The keel for the lead sub in class, Sankt-Petersburg (B-585), was laid down in December 1997 and launched in October 2004. The submarine was delivered to the Russian Navy in April 2010 and commissioned in May 2010.

The keel for the second submarine, Kronshtadt (B-586), was laid in July 2005 and the launching ceremony was held in September 2018.

The keel-laying ceremony of the third submarine, formerly known as Sevastopol (B-587), was held in November 2006. The submarine was renamed as Velikie Luki and re-laid in February 2015 due to a redesign after continuous delays. The Velikie Luki is expected to be commissioned in 2021.

The Ministry of Defense of the Russian Federation and Admiralty Shipyards signed a contract for another two Project 677 Lada submarines in June 2019. The keel-laying for the submarines is expected to take place in 2022, while commissioning is planned for 2025 and 2027 respectively.

The Russian Navy plans to procure a total of eight Lada Class submarines.

Lada Class missions capabilities

The Project 677 submarine is an improved version of the Project 636 Kilo Class with much quieter, powerful propulsion and new combat systems. The fourth-generation submarines can be deployed in anti-submarine warfare (ASW) and anti-surface warfare (AsuW) operations, protection of naval bases, reconnaissance and patrol missions.

The export variant of the Lada Class, the Project 1650 Amur Class, was designed for markets such as India and China. Amur Class is offered in various configurations with a displacement of 550t to 1,850t and different weapon systems.

Lada Class design and features

Lada Class diesel-electric submarines are designed by the Russian Rubin Design Bureau. The ship incorporates a mono-hull design. The surface displacement was reduced to 1,765t from 2,300t of the double-hulled Kilo Class submarine.

"The Project 677 Lada Class diesel-electric submarines are being built by Admiralty Shipyard for the Russian Navy."

The full submerged speed was increased from 19k to 21k, and crew complement was decreased from 52 to 35.

The submarine has a trimmed profile equipped with the sophisticated torpedo and missile systems. The hull is covered with a new anti-sonar coating for low acoustic signature.

Lada Class uses hydrogen-oxygen fuel cells, generating electricity for low noise operation. The submarine is fitted with Litiy automated combat control system. The integrated system controls the combat and technical systems of the submarine.

The Lada Class has a surface speed of 10k and a submerged speed of 21k. The propulsion system provides a submerged cruising range of 7,500nmi at an economical speed of 3k. The maximum diving depth is 300m. The submerged displacement of the boat is 2,700t.

Weapon systems on board the Project 677 Lada Class

Lada Class is armed with club-S submarine-launched cruise missiles. The missile can be fired from standard torpedo tubes.

Club-S carries up to 400kg warheads and can strike land and naval targets within a range of 300km. The six 533mm torpedo tubes fitted on the ship can launch up to 18 torpedoes, tube-launched anti-submarine and anti-ship missiles.

The Lada Class submarines are fitted with modern sonar equipment such as bow, flank arrays and towed array sonars. The Lira sonar system with quasi-conformal (abutting the hull of the submarine) antenna can detect low-noise targets located at long ranges.

The ship has an inertial navigation system for safe navigation and determination of motion parameters. The system ensures the accuracy of on-board weapons by providing guidance during long underwater operations. The countermeasures are provided by the electronic support measures (ESM) system, radar warning receiver and direction finder.

Propulsion and power

The submarine’s propulsion system integrates two diesel generators, a main electric propulsion motor, two air-independent propulsion (AIP) systems and a single shaft driving on a skewed seven-bladed propeller.

The AIP system based on oxygen / hydrogen fuel cells increases the Lada Class submerged endurance from 15 to 45 days. It also reduces noise as it does not require frequent battery recharge by diesel generators.

The diesel engine operating for a short time in the snorkelling mode increases the endurance of the submarine. The submarine also has a storage battery with increased service life.