Class overview
Name:	St. Petersburg class
Builders:	Admiralty Shipyard, Saint Petersburg
Operators:	Russian Navy
Preceded by:	Kilo class
Succeeded by:	Project Kalina, Amur class
Built:	1997–present
In service:	2010–present
Planned:	12[1]
Building:	1
Completed:	2
Active:	1
General characteristics
Type:	Attack submarine
Displacement:	2,700 long tons (2,700 t) submerged 1,765 long tons (1,793 t) surfaced
Length:	72 m (236 ft 3 in); 67 m (219 ft 10 in) on waterline
Beam:	7.1 m (23 ft 4 in)
Draught:	6.5 m (21 ft 4 in)
Propulsion:	Electric propulsion motor on permanent magnets Storage battery with increased service life 2 diesel Air Independent Propulsion (AIP) systems based on oxygen-hydrogen fuel cells (perspectively) 1 shaft 2,700 hp (2,013 kW)
Speed:	21 kn (24 mph; 39 km/h) submerged 10 kn (12 mph; 19 km/h) surfaced
Endurance:	45 days
Test depth:	300 m (984 ft)
Complement:	35 officers and men
Sensors and processing systems:	Litiy CICS
Armament:	6 × 533-millimetre (21 in) torpedo tubes 18 torpedoes or SSMs or 44 mines 10 Kalibr / Club land-attack cruise missile, anti-ship missile and anti-submarine missile (some versions)[2] RPK-6/SS-N-16 Vodopad/Stallion

Project 677 or Lada class (Russian: Лада; NATO Reporting Name: St. Petersburg class, after the name of the lead vessel, Sankt Peterburg) is the new advanced class of diesel-electric attack submarine designed by the Russian Rubin Design Bureau. A program to develop a "fourth generation" diesel-electric submarine, it aimed to produce a highly improved version of the Project 636 Kilo class with much quieter, new combat systems, and possibly air-independent propulsion.


The lead ship of the class, named Sankt Peterburg, was launched in October 2004 and began sea trials in November 2005. The submarine was transferred to the Russian Navy in April 2010.^[3] Another two vessels were under construction at the Admiralty Shipyard with plans to launch four to six submarines by 2015. The Russian Navy had set out a requirement for a total of eight St. Petersburg-class submarines.^[4]

However, in November 2011 the Russian Navy decided that this class of submarines would not be accepted into service, as the lead boat had fallen far short of requirements during tests.^[5] The lead boat was retained as a test vessel to experiment with various systems. The construction of the remaining boats of the class was frozen.

On 27 July 2012, the Russian Navy commander-in-chief announced the resumption of the construction of the St. Petersburg-class submarines, having undergone extensive design changes.^[6] In 2013 and 2015, two further boats were re-laid and commissioning was expected in 2017 and 2018.

The first serial diesel-electric submarine of the newest project 677 "Lada" is planned to be launched at the St. Petersburg shipyard "Admiralteiskie Verfi" in 2018.^[7]

Indonesia had once indicated its interest in acquiring two St. Petersburg-class submarines, but the deal has fallen through due to financing issues.^[8]

In June 2017, the Russian Navy revealed it plans to order two more Lada-class submarines.

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