The Lada-class submarine is Russia's Project 677 diesel-electric attack submarine family, designed by Rubin and built by Admiralty Shipyards as a low-signature conventional boat for coastal, confined-water, and blue-water tasks. The class combines six 533 mm tubes with torpedo-missile armament, automated control, improved sonar, and optional air-independent-propulsion provisions; Russian sources reported a return to serial service with Kronstadt in 2024 and Velikiye Luki in 2025 after the troubled Sankt Peterburg prototype.
Open-source reporting confirms the Project 677/Lada class is actively fielded by the Russian Navy, including Kronstadt's commissioning and assignment to the Northern Fleet, but the available sources do not tie this page to a specific named conflict, so it remains in 2015 Various Conflicts.
The class is best read as a prototype-to-serial program rather than a large mature fleet: Rubin says trial-operation results changed the follow-on design, and later reporting tracks a slow restart around Kronstadt and Velikiye Luki.
| Boat or group | Status point | Why it matters |
|---|---|---|
| B-585 Sankt Peterburg | Prototype and trial-operation boat | Rubin says the follow-on technical design reflected lessons from trial operation. |
| B-586 Kronstadt | Commissioned January 2024 | Reported as the first serial boat and assigned to the Northern Fleet. |
| B-587 Velikiye Luki | Joined the Russian Navy on 16 December 2025 | Rubin reported successful shipyard and state trials, including checks of torpedo-missile armament. |
| Vologda and Yaroslavl | Under construction after June 2022 laying down | They show the continued Project 677 production line beyond the first serial pair. |
Rubin and Admiralty Shipyards describe Project 677 as a compact fourth-generation conventional submarine built around automation, acoustic protection, a stronger sonar suite, and torpedo-missile armament. The official descriptions emphasize littoral and confined-water operations, but Rubin also describes the design as suitable for modern conventional-submarine missions in both littoral and blue-water areas.
Project 677 began with the Sankt Peterburg prototype, then moved to modified serial boats after trial-operation changes were folded into the design.
| Variant | Configuration | Designation notes |
|---|---|---|
| B-585 Sankt Peterburg | Prototype Project 677 boat | Rubin describes Project 677 trial operation as the basis for a revised technical design used on follow-on submarines. Sources: Project 677 - Rubin |
| B-586 Kronstadt | First serial Project 677 boat | Kronstadt was commissioned in January 2024 and reported assigned to the Northern Fleet after construction to a modified Project 677 design. Sources: Russia commissions second Lada-class submarine, Russia Commissions First Serial Lada-class Submarine |
| B-587 Velikiye Luki | Second serial Project 677 boat | Admiralty Shipyards launched Velikiye Luki under an adjusted project in 2022, and Rubin reported the boat joined the Russian Navy after Baltic Sea state trials in December 2025. Sources: Project 677 Velikiye Luki Launched by Admiralty Shipyards, The Third Lada Submarine Velikiye Luki Has Joined the Russian Navy |
| Vologda and Yaroslavl | Follow-on Project 677 boats | SeaWaves reported Admiralty Shipyards continued construction of the paired Vologda and Yaroslavl hulls after their June 2022 laying down. Sources: Project 677 Velikiye Luki Launched by Admiralty Shipyards |
Open reporting and Russian official statements describe the Lada class as carrying torpedo-missile armament through its bow tubes.
| Ammunition | Ammunition type | Firing evidence |
|---|---|---|
 | Sea-launched cruise missile family | Baird Maritime reported that Velikiye Luki's armament includes Kalibr land-attack and anti-ship missiles, while TASS described Project 677 boats as armed with missile and torpedo systems for sea and land targets. Sources: Russian Navy's third Lada-class submarine commissioned into service, Two Project 677 Lada submarines to be laid down in 2026 - TASS |
Open reporting covered the launch of the second Project 677 boat after a long construction pause and redesign work.
Sources: Russia commissions second Lada-class submarine
Janes and Naval News reported that the Russian Navy formally commissioned Kronstadt at Admiralty Shipyards in St Petersburg, confirming the class's return to active fielding.
Sources: Russia commissions second Lada-class submarine, Russia Commissions First Serial Lada-class Submarine
SeaWaves reported that Admiralty Shipyards continued construction of the Vologda and Yaroslavl Project 677 boats after their paired June 2022 laying down.
Sources: Project 677 Velikiye Luki Launched by Admiralty Shipyards
Admiralty Shipyards launched Velikiye Luki under an adjusted Project 677 design that incorporated trial-operation changes from the lead boat.
Sources: Project 677 Velikiye Luki Launched by Admiralty Shipyards
Rubin reported that the third Lada submarine joined the Russian Navy after shipyard and state trials in the Baltic Sea.
Sources: The Third Lada Submarine Velikiye Luki Has Joined the Russian Navy, Russian Navy's third Lada-class submarine commissioned into service
