Naval Systems

Sarov-class submarine

The Sarov-class submarine is Russia's B-90 Project 20120 special-purpose submarine, a one-off hybrid diesel-electric and nuclear test boat built by Krasnoye Sormovo and Sevmash under Rubin design authority. Open sources describe it as a highly secretive platform for reactor trials and undersea weapons development, not a standard fleet attack submarine.

Profile

Origin
Russia
Built by
Krasnoye Sormovo ShipyardSevmash
Type
Special-purpose submarine
Service note
2008-present
Designer
Rubin Design Bureau
Designed
Late 1980s; revised 2001-2003
Produced
1988-2008
Number built
1
Variants
B-90, Project 20120 Sargan

Also Known As

  • B-90 Sarov
  • Project 20120
  • Project 20120 Sargan
  • Sarov class
  • NATO: Sarov class

Specifications

Displacement
2,300 tonnes surfaced; 3,950 tonnes submerged
Length
72.6 m
Beam
9.9 m
Draught
7 m
Speed
10 knots surfaced; 17 knots submerged
Endurance
45 days
Complement
52
Propulsion
Diesel-electric plant with auxiliary nuclear reactor / electrochemical generator

Service And Conflict Use

Service History

In service
Laid down in 1988, launched in 2007, and commissioned into the Russian Navy in 2008. Open reporting treats Sarov as a test platform rather than a frontline combat submarine.
Used by
Russian Navy

Conflict Usage

Side
🏳️Unspecified

Open sources describe B-90 Sarov / Project 20120 as a highly secretive Russian special-purpose submarine used to test new reactor technologies and undersea systems, including Poseidon-related work. The sources do not connect it to a specific cataloged combat conflict, so it remains filed under Various Conflicts as a holding category.

Timeline

Sarov-class submarine Key Events

  1. Hull work begins at Krasnoye Sormovo

    The unfinished Project 20120 hull was laid down at Krasnoye Sormovo before the program was halted in the post-Soviet funding collapse.

    Sources: Project 20120 Sarov Experimental Submarine

  2. Sarov is launched at Severodvinsk

    After work resumed at Sevmash, the submarine was launched and moved closer to completion under the new Sarov name.

    Sources: Project 20120 Sarov, Sarov Class submarine demystified

  3. Commissioned into the Russian Navy

    The Russian Navy accepted the submarine into service, making B-90 Sarov the only completed Project 20120 boat.

    Sources: Project 20120 Sarov, Sarov Class submarine demystified

Related Weapon Systems

Sources