Russia’s Fifth-Generation Submarines to Get 20% Thinner Coating


In a significant advancement for naval stealth technology, Russia’s fifth-generation submarines are set to receive a new hydroacoustic rubber coating that is 20% thinner than its predecessors, according to Valery Polovinkin, the principal science advisor at the Krylov State Research Center (KSRC). This development was reported by Sputnik on Monday. The reduction in thickness is a notable achievement in submarine technology, promising enhanced stealth capabilities and operational efficiency.

Revolutionary Coating Technology

Polovinkin elaborated on the significance of the thinner coating, emphasizing that it is not merely a change in the formulation of substances but involves the creation of special channels within the coating. “We are talking about a thickness reduction of about 10-20%, which is quite significant. It’s not just the formulation of substances—special channels are made in the coating. It is not just a monolith but a construction, because air is the best insulator,” he stated. This innovative design leverages the insulating properties of air to enhance the submarine’s stealth.

The need for improved camouflage coatings is critical in modern naval warfare. Polovinkin noted that no armor could completely withstand armor-piercing projectiles, making it essential to develop advanced concealment technologies. “Unfortunately, the projectile wins the notorious battle of ‘the shell hit versus the armor.’ We need to hide the ships,” he explained. This acknowledgment underscores the ongoing arms race in naval technology, where stealth and detection capabilities play a pivotal role.

Advancements in Polyfunctional Coatings

The KSRC, recognized as the main developer of the latest ship and material designs for the Russian Navy, is at the forefront of developing polyfunctional coatings for fifth-generation submarines. These coatings are designed to serve multiple functions, including reducing the vessel’s acoustic signature and improving its resistance to detection by enemy forces. The new coatings represent a leap forward in submarine technology, offering enhanced performance in various operational scenarios.

The Project 677 Lada-Class Submarines

The Project 677 Lada-class diesel-electric submarines epitomize the cutting edge of Russian submarine technology. These vessels are designed for a range of missions, including reconnaissance, surveillance, anti-submarine warfare, anti-shipping, and mine-laying. They are equipped with advanced technology, featuring improved stealth capabilities, enhanced communication systems, and state-of-the-art torpedoes.

Igor Vilnit, the general director of the Rubin Central Design Bureau of Marine Engineering, highlighted the superior stealth capabilities of the Project 677 Lada non-nuclear submarines compared to their predecessors. “In terms of stealth parameters, this submarine is several times superior to its predecessors. The boat maintains an extremely low noise level thanks to its specially designed equipment. Additionally, it extensively incorporates modern acoustic protection equipment, an external anti-hydrolocation coating, and carefully designed hull contours to ensure low visibility,” Vilnit said in an interview.

Enhanced Hydroacoustic Systems

One of the standout features of the Project 677 submarines is their powerful hydroacoustic system. Vilnit emphasized the impressive capabilities of this system, noting its ability to detect targets at a significantly longer range. “I would like to emphasize the hydroacoustics of the Lada: it is not only a wider range of acoustic waves, it is a significantly longer range of target detection. It took a lot of effort to achieve this result,” he specified.

This advanced hydroacoustic system requires a high-speed data processing capability to differentiate useful signals from background noise and interference. Additionally, it must classify targets accurately, determining their speed, depth, and direction of travel. These capabilities are critical for effective submarine operations, particularly in contested maritime environments.

The Kronstadt Submarine

The first serial-produced Project 677 Lada submarine, the Kronstadt, is currently being readied for delivery to the Russian Navy. Built at the Admiralty shipyards in St. Petersburg, the Kronstadt embodies the latest advancements in submarine design and technology. Its delivery marks a significant milestone in the modernization of the Russian submarine fleet.

The Kronstadt’s stealth parameters are particularly noteworthy. Vilnit explained that the submarine maintains an extremely low noise level, a critical factor in avoiding detection by enemy forces. The incorporation of modern acoustic protection equipment and an external anti-hydrolocation coating, combined with carefully designed hull contours, ensures that the submarine remains virtually invisible to enemy sonar.

Missile-Torpedo Arsenal and Electronic Warfare

The Project 677 submarines are equipped with a formidable missile-torpedo arsenal, enhancing their combat capabilities. These submarines are designed to carry a variety of weapons, enabling them to engage a wide range of targets. In addition to their missile-torpedo arsenal, the submarines are equipped with advanced radio-electronic weaponry, further enhancing their operational effectiveness.

Vilnit highlighted the importance of the missile-torpedo arsenal and radio-electronic weaponry, noting that these capabilities make the Project 677 submarines formidable adversaries. “What’s more, he spotlighted the impressive missile-torpedo arsenal, and radio-electronic weaponry found in these subs,” he said.

Future Prospects and Strategic Implications

The development and deployment of fifth-generation submarines with advanced stealth capabilities and powerful hydroacoustic systems represent a significant enhancement of Russia’s naval capabilities. These advancements have far-reaching strategic implications, potentially altering the balance of power in key maritime regions.

The integration of thinner hydroacoustic rubber coatings and polyfunctional materials is expected to improve the operational efficiency and survivability of Russian submarines. These advancements will enable the Russian Navy to conduct a wider range of missions with greater effectiveness, from intelligence gathering and surveillance to direct combat operations.

Furthermore, the Project 677 Lada-class submarines’ enhanced stealth capabilities and advanced hydroacoustic systems will make them difficult to detect and track, providing a critical advantage in contested maritime environments. This stealth advantage will be particularly valuable in the event of a conflict, allowing Russian submarines to operate undetected and strike targets with precision.

Global Naval Dynamics

The advancements in Russian submarine technology come at a time of heightened global naval competition. Major naval powers, including the United States, China, and NATO member states, are investing heavily in submarine technology to maintain and enhance their underwater warfare capabilities.

In response to these developments, other nations may seek to accelerate their own submarine programs, leading to a new phase of the global naval arms race. The focus on stealth, advanced hydroacoustic systems, and missile-torpedo capabilities will likely become key areas of competition, as nations strive to gain an edge in underwater warfare.

The Role of the KSRC and Rubin Central Design Bureau

The KSRC and the Rubin Central Design Bureau of Marine Engineering play crucial roles in the development of Russia’s fifth-generation submarines. The KSRC’s expertise in ship and material design, coupled with Rubin’s experience in submarine engineering, has enabled the successful development of the Project 677 Lada-class submarines.

These institutions are at the forefront of naval research and development, continually pushing the boundaries of what is possible in submarine technology. Their work on advanced coatings, hydroacoustic systems, and missile-torpedo integration has positioned Russia as a leading player in the field of underwater warfare.

In conclusion…..

The introduction of 20% thinner hydroacoustic rubber coatings for Russia’s fifth-generation submarines marks a significant technological advancement in naval stealth capabilities. Spearheaded by the Krylov State Research Center and the Rubin Central Design Bureau of Marine Engineering, these innovations promise to enhance the operational effectiveness and survivability of Russian submarines.

The Project 677 Lada-class submarines, with their advanced stealth features, powerful hydroacoustic systems, and formidable missile-torpedo arsenal, represent the cutting edge of submarine technology. As these submarines are deployed, they will play a crucial role in shaping the future dynamics of global naval power.

In the context of increasing global naval competition, the advancements in Russian submarine technology underscore the importance of continuous innovation and investment in underwater warfare capabilities. As nations strive to maintain and enhance their naval power, the development of advanced stealth technologies and hydroacoustic systems will remain a critical area of focus.

The successful implementation of these technologies in the Project 677 Lada-class submarines serves as a testament to Russia’s commitment to maintaining its strategic edge in underwater warfare. As these submarines enter service, they will undoubtedly influence the strategic calculations of naval powers around the world, heralding a new era of competition and innovation in submarine technology.

Strategic Implications for Global Naval Warfare

The strategic implications of Russia’s advancements in submarine technology extend beyond the immediate enhancements to its own naval capabilities. These developments are likely to influence the strategic calculations and procurement decisions of other major naval powers.

Enhanced Deterrence and Operational Flexibility

The introduction of the Project 677 Lada-class submarines, with their advanced stealth capabilities and powerful hydroacoustic systems, enhances Russia’s deterrence posture. The ability to deploy submarines that are difficult to detect and capable of carrying out a range of missions provides Russia with greater operational flexibility.

This operational flexibility is particularly valuable in contested maritime regions where the ability to operate undetected can provide a significant tactical advantage. The enhanced stealth capabilities of these submarines will allow the Russian Navy to conduct intelligence gathering, surveillance, and combat operations with a reduced risk of detection and engagement by enemy forces.

Influence on Submarine Development Worldwide

The advancements in Russian submarine technology are likely to influence the development priorities of other major naval powers. Nations such as the United States, China, and NATO member states are expected to accelerate their own submarine research and development efforts in response to Russia’s technological progress.

The focus on reducing the acoustic signature of submarines, improving hydroacoustic systems, and enhancing missile-torpedo capabilities will become key areas of competition in the global naval arms race. As countries strive to maintain or gain an edge in underwater warfare, investment in advanced submarine technologies will likely increase.

Implications for Naval Strategy and Doctrine

The deployment of fifth-generation submarines with advanced stealth capabilities and powerful hydroacoustic systems will necessitate adjustments in naval strategy and doctrine. For Russia, the enhanced capabilities of the Project 677 Lada-class submarines will provide greater flexibility in planning and executing naval operations.

Other naval powers will need to develop countermeasures and strategies to detect and neutralize these advanced submarines. This may involve the development of new sonar technologies, the deployment of more advanced anti-submarine warfare (ASW) assets, and the refinement of operational tactics to counter the threat posed by stealthy submarines.

Economic and Industrial Implications

The development and production of advanced submarines such as the Project 677 Lada-class have significant economic and industrial implications. The investment in submarine technology drives innovation in related industries, including materials science, acoustics, and electronics.

The production of these submarines also supports the domestic defense industry, creating jobs and fostering technological expertise. As other nations seek to develop their own advanced submarines, the demand for cutting-edge technologies and materials will drive further economic activity and industrial development.

The Future of Underwater Warfare

The advancements in Russian submarine technology represent a significant step forward in the evolution of underwater warfare. The integration of thinner hydroacoustic rubber coatings, advanced polyfunctional materials, and powerful hydroacoustic systems sets a new standard for submarine stealth and detection capabilities.

As these technologies continue to evolve, the nature of underwater warfare will likely change. Submarines will become increasingly difficult to detect, and the competition to develop the most advanced stealth and detection technologies will intensify. This will lead to a continuous cycle of innovation, with each new development prompting further advancements in countermeasures and offensive capabilities.

APPENDIX 1 – The B-586 Kronstadt: A Detailed Examination of Russia’s New Lada-Class Submarine

The B-586 Kronstadt, a cutting-edge conventional multi-purpose submarine, represents the latest advancements in Russian naval engineering. Built by the Admiralty Shipyards as part of the Project 677 Lada-class, the Kronstadt is the first serial unit following the prototype B-585 St. Petersburg. This document delves into the development, specifications, capabilities, and current status of the B-586 Kronstadt, reflecting on its journey from inception to commissioning and operational deployment.

Historical Context and Development

Project 677 Lada-Class

The Project 677 Lada-class, developed by the Central Design Bureau of Maritime Technology “Rubin” in St. Petersburg, aims to replace older submarine classes (Projects 613, 641, and 877) operating primarily in enclosed seas such as the Baltic and Black Seas. Initially, there were plans to produce 20 Lada-class submarines for the Russian Navy (VMF) with aspirations for international exports.

Prototype: B-585 St. Petersburg

The keel of the prototype, B-585 St. Petersburg, was laid in 1997, and the vessel was launched in 2004. Despite its innovative design, including a single-hull structure and new technological features, sea trials revealed significant flaws. Issues with the propulsion unit, sonar systems, and other critical components delayed its operational readiness, leading to its commissioning into trial service in 2010 and eventual operational service in 2021​ ​.

Construction and Challenges

B-586 Kronstadt

Construction of the B-586 Kronstadt began in 2005, even before the prototype’s tests were completed. However, the discovery of flaws in the prototype led to a halt in construction. The program was resumed in 2013 with significant design modifications to address the identified issues. Improved systems, including the control systems for equipment and mechanisms, electric motor, and navigation systems, were incorporated into the Kronstadt​ .

Specifications and Capabilities


  • Surfaced: 1,765 tons
  • Submerged: 2,650 tons


  • Length: 66.8 meters
  • Beam (width): 7.1 meters
  • Draft: 6.6 meters


  • Surfaced: 10 knots
  • Submerged: 21 knots

Operational Depth:

  • Working depth: 250 meters
  • Maximum depth: 300 meters


  • 35 personnel


  • 45 days at sea


  • Diesel-electric engine with full electric propulsion
  • Two diesel generators: 1250 kW each
  • All-mode electric motor: 4050-5500 horsepower
  • Two backup electric motors: 102 horsepower each
  • Single low-noise propeller
  • Two battery banks: each with 120 elements


  • Six 533 mm torpedo tubes
  • Capacity for 18 torpedoes, missiles, or sea mines
  • “Kalibr” missile system
  • Air defense: “Igla-1M”, “Strela-3M”, and “Verba” systems with 8 missiles in transport and launch containers

Key Features:

  • Stealth: Utilizes a single-hull design with an AB-2 strength steel pressure hull and a Molniya hull anechoic coating, significantly enhancing stealth capabilities.
  • Hydro-acoustic Complex: Equipped with a powerful hydro-acoustic system that extends the detection range of targets.
  • Combat Management: Features the Litiy automated combat management system and the Lira sonar system, which includes a conformal antenna in the bow.
  • Optronic Mast: Fitted with the Parus-98 optronic mast for better surveillance capabilities.
  • Integrated Communications: Includes the Distantsiya integrated communications system for robust and secure communication.

Recent Updates:

  • The B-586 Kronstadt has been modernized with improved technical control systems, electric propulsion, and navigation systems. It underwent extensive sea trials starting in December 2021 and was formally commissioned on January 31, 2024​​.

Detailed Scheme Table:

Displacement1,765 tons (surfaced) / 2,650 tons (submerged)
Length66.8 meters
Beam7.1 meters
Draft6.6 meters
Speed10 knots (surfaced) / 21 knots (submerged)
Operational Depth250 meters (working) / 300 meters (max)
Endurance45 days
PropulsionDiesel-electric with 1250 kW generators, 4050-5500 HP motor, 102 HP backup motors
Battery BanksTwo, each with 120 elements
Torpedo TubesSix 533 mm
Armament18 torpedoes/missiles/mines, Kalibr missile system, Igla-1M, Strela-3M, Verba AA systems
Hydro-acoustic SystemAdvanced sonar with extended detection range
Combat ManagementLitiy automated system
Optronic MastParus-98
CommunicationsDistantsiya integrated system

This detailed technical overview highlights the advanced capabilities of the B-586 Kronstadt, reflecting its status as one of the most sophisticated submarines in the Russian fleet​

Operational Status and Deployment


The B-586 Kronstadt was officially commissioned into the Russian Navy on January 31, 2024, at a ceremony held at the Admiralty Shipyards in St. Petersburg. High-ranking officials, including Admiral Nikolai Yevmenov, Commander-in-Chief of the Navy, and Northern Fleet Commander Alexander Moiseyev, attended the event. The Kronstadt has been assigned to the 161st Submarine Brigade of the Kolsk Flotilla, based in Polyarnyy, as part of the Northern Fleet​ ​.

Sea Trials and Performance

The Kronstadt underwent extensive sea trials beginning in December 2021. These trials demonstrated its superior stealth, maneuverability, and reliability. The submarine’s advanced hydro-acoustic capabilities and its ability to operate undetected by enemy forces were particularly highlighted during these tests​.

Future Developments

Currently, Admiralty Shipyards continues the construction of additional Project 677 Lada-class submarines. The third vessel, B-587 Velikiye Luki, completed factory sea trials in December 2023. Two more submarines, Vologda and Yaroslavl, had their keels laid in June 2022, with plans for their completion in the coming years. The Russian Navy aims to have a total of eight Lada-class submarines by the late 2020s​ ​.

The B-586 Kronstadt embodies the Russian Navy’s commitment to advancing its submarine fleet with modern, stealthy, and highly capable vessels. Despite initial setbacks and technical challenges, the Kronstadt and its Lada-class counterparts are poised to play a crucial role in the operational strategy of the Northern Fleet, ensuring the Russian Navy’s continued dominance in underwater warfare.

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