OVERVIEW: The PL-677 Lada [B 586 Kronshtadt] is a diesel-electric submarine of the Project 677 Lada class, serving with the Russian Navy. Commissioned in 2024, the Kronshtadt represents the second vessel of this class and a significant step in the modernization of Russia's non-nuclear submarine force.

DETAILS:
The Project 677 Lada class represents a new generation of Russian diesel-electric submarines, designed as a successor to the Improved Kilo-class (Project 636.3). Development was initiated in the late 1990s by the Rubin Design Bureau, with a focus on improved acoustic stealth, enhanced combat capabilities, and extended operational range compared to its predecessors. The design incorporates advanced noise reduction techniques, including anechoic coatings, decoupled machinery, and optimized hull shaping, making it one of the quietest diesel-electric submarines currently in service. The Lada class also features a modular design, allowing for easier upgrades and adaptations to future technological advancements. Delays in the program meant that the lead boat was laid down in 1997 but only commissioned in 2010, and the second unit, *Kronshtadt*, was subject to further delays leading to its 2024 commissioning.

The PL-677 Lada, like other submarines of its class, is primarily intended for anti-submarine warfare (ASW) and anti-surface warfare (ASuW) operations in littoral waters. Its stealth characteristics and advanced sensor suite make it particularly effective in detecting and engaging enemy submarines and surface combatants in contested environments. Additionally, the Lada class can be employed for intelligence gathering, surveillance, and reconnaissance (ISR) missions, as well as for special operations support. The vessel is designed to operate independently or as part of a larger naval task force, providing a versatile and valuable asset for a wide range of naval operations. The inclusion of the SA-N-10 Gimlet mast launcher provides a limited self-defense AAW capability.

The PL-677 Lada's combat effectiveness is significantly enhanced by its comprehensive sensor suite. The installation of the Lira hull-mounted and towed array sonars provides long-range detection and tracking of underwater contacts. The Mouse Roar (MG-519 Arfa) sonar is likely employed for mine avoidance and obstacle detection. The Squid Head (MRP-25) radar provides surface search and navigation capabilities. The Snoop Tray 2 (MRK-50 Kaskad) radar likely serves as an electronic support measures (ESM) system. The Acoustic Intercept (MG-53) further enhances the submarine's ability to passively detect and classify enemy vessels. The combination of optical and low-light television (LLTV) periscopes allows for visual observation and target identification in various lighting conditions. Armament consists of 533mm torpedo tubes capable of launching a variety of anti-submarine and anti-surface torpedoes, as well as potentially cruise missiles, along with the self-defense SA-N-10 system.

SPECIFICATION: Length: 66.8 m || Beam: 7.1 m || Draft: 6.7 m || Disp: 1765 t

SENSORS: Quad Loop DF || Squid Head [MRP-25] || Mouse Roar [MG-519 Arfa] || Snoop Tray 2 [MRK-50 Kaskad] || Acoustic Intercept [MG-53] || Lira [Hull] || Lira [Towed Array] || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT || SA-N-10 Gimlet [9K310 Igla-1] Mast Launcher || Signal Ejector