Rubis-class submarine

Also known as

Rubis class
Rubis-class
Classe Rubis
Rubis-class submarine
SNA type Rubis
SNA Rubis
SNA 72
Rubis-Améthyste class
Rubis Améthyste class
Rubis-class attack submarine

The Rubis class is France's first generation of nuclear-powered attack submarines, built at Cherbourg for the French Navy and later modernized under the Améthyste program. The compact class has documented service in NATO and French operations from Kosovo to Libya, where public sources describe escort, area-denial, surveillance, intelligence, and sea-control roles rather than public missile or torpedo firings.

Rubis-class submarine, Nuclear-powered attack submarine class, Naval Systems

Image source: Rubis 02.jpg

Role in Conflicts

Side: NATO

Mer et Marine reports that Rubis-class submarines rotated off the mouths of Kotor during the Kosovo War, using their submerged presence to inhibit Serbian naval movement while supporting NATO's air campaign.

Side: United States, NATO, and Afghan government forces

The French Navy history of Rubis says the submarine protected Task Force 473 in 2002 during the naval component of operations against terrorist networks off Afghanistan.

Role details

Side: NATO-led coalition

During Operation Harmattan off Libya, the French Navy says Rubis was one of three French nuclear attack submarines that rotated on intelligence missions during the conflict; an official 2024 bulletin lists Améthyste, Rubis, and Saphir crews with 2011 Harmattan participation windows.

Fleet Snapshot

The French Navy identifies six completed Rubis-class boats, all built at Cherbourg and based in the Toulon attack-submarine squadron.

Boat	Service entry	Catalog note
Rubis	23 February 1983	Lead boat; second class member retired after Saphir.
Saphir	6 July 1984	Second boat; retired before Rubis in the replacement sequence.
Casabianca	21 April 1987	Early-batch boat later refitted to Améthyste standard.
Émeraude	15 September 1988	Early-batch boat later refitted to Améthyste standard.
Améthyste	3 March 1992	Final-batch standard that gave the modernization program its name.
Perle	7 July 1993	Last completed boat of the class.

Profile / Specs

Profile

Origin: France
Built by: Naval Group
Type: Nuclear-powered attack submarine class
Service note: 1983-present
Designer: DCN / Naval Group lineage
Designed: 1972-1976
Produced: 1976-1993
Number built: 6 completed, 2 canceled
Developed into: Suffren-class submarine

Specifications

Length: 73.6 m
Beam: 7.6 m
Draught: 6.4 m
Displacement: 2,670 tons surfaced; 2,740 tons submerged
Crew: 68 to 70 personnel, with alternating blue and red crews
Speed: 25 knots submerged
Max depth: 300 m
Endurance: More than 45 days
Propulsion: One K48 pressurized-water nuclear reactor with turbo-electric drive
Armament: Four 533 mm torpedo tubes; F17 torpedoes; SM39 Exocet anti-ship missiles; mine capacity
Sensors: DMUX 20 passive sonar suite, ETBF DSUV 62C towed array, DUUG-7 sonar, and navigation radar fit reported in public sources

Weapons And Sensors

The class combines a compact nuclear propulsion plant with a mixed torpedo-tube weapons load for submarine, surface-ship, mine, and intelligence tasks.

Subsystem	Documented fit
Torpedo tubes	Four 533 mm tubes with a mixed capacity of torpedoes, SM39 Exocet missiles, or mines.
Torpedoes	F17 Mod 2 heavyweight torpedoes; public reporting also notes the transition path toward F21 on remaining French attack submarines.
Anti-ship missile	SM39 Exocet, launched from a torpedo tube in a submerged-change medium capsule.
Sonar	Naval Technology describes a DMUX 20 multifunction passive sonar suite with towed-array and DUUG-7 elements.
Propulsion	A K48 pressurized-water nuclear reactor and turbo-electric drive give the boats sustained submerged endurance.

Variants

The class began as the SNA 72 / Provence design, then converged on the quieter Améthyste standard: the final two boats were built to that configuration, and the first four were refitted to match it.

Variant	Configuration	Designation notes
Original SNA 72 / early Rubis configuration	Lead-batch configuration	Rubis, Saphir, Casabianca, and Émeraude entered service before being refitted between 1989 and 1995 around the quieter Améthyste standard. Sources: Le SNA Rubis va prendre sa retraite
Améthyste standard	Acoustic and electronics modernization	The Améthyste refit reshaped and lengthened the hull around the final-batch design and improved acoustic discretion and combat-system fit. Sources: Le SNA Rubis va prendre sa retraite, SSN Rubis Amethyste Class
Turquoise derivative	Canceled/export derivative	Naval Technology describes Turquoise as a diesel-propulsion derivative of the Rubis-Améthyste design intended for export rather than a completed French Navy boat. Sources: SSN Rubis Amethyste Class

Variant

Configuration

Designation notes

Original SNA 72 / early Rubis configuration

Lead-batch configuration

Rubis, Saphir, Casabianca, and Émeraude entered service before being refitted between 1989 and 1995 around the quieter Améthyste standard.

Sources: Le SNA Rubis va prendre sa retraite

Améthyste standard

Acoustic and electronics modernization

The Améthyste refit reshaped and lengthened the hull around the final-batch design and improved acoustic discretion and combat-system fit.

Sources: Le SNA Rubis va prendre sa retraite, SSN Rubis Amethyste Class

Turquoise derivative

Canceled/export derivative

Naval Technology describes Turquoise as a diesel-propulsion derivative of the Rubis-Améthyste design intended for export rather than a completed French Navy boat.

Sources: SSN Rubis Amethyste Class

Timeline

Rubis-class submarine Key Events

Dec 11, 1976
Lead boat is laid down
The first Rubis boat was laid down in Cherbourg on 11 December 1976, beginning the class's construction run.
Sources: Dernier accostage du SNA Rubis
Feb 23, 1983
Rubis enters active service
The French Navy admitted Rubis to active service on 23 February 1983 after its reactor start-up and sea trials.
Sources: Dernier accostage du SNA Rubis
Jul 7, 1993
Perle joins the fleet
The last boat in the class, Perle, entered active service on 7 July 1993 and completed the Rubis production run.
Sources: Les sous-marins nucléaires d'attaque (SNA) type Rubis
Mar 24, 1999
Kosovo War deployment begins
During NATO's 1999 Kosovo air campaign, Mer et Marine reports that Rubis-class submarines rotated off the mouths of Kotor to inhibit Serbian naval movement.
Sources: Le SNA Rubis va prendre sa retraite
Mar 18, 2011
Harmattan submarine rotations begin
Official Harmattan records list Rubis crew participation from 18 March 2011, and later entries for Améthyste, Rubis, and Saphir document multiple Rubis-class crews in the Libya operation.
Sources: Arrêté Harmattan bâtiments et unités 2024, Arrêté Harmattan actions de feu 2026
Jun 1, 2022
Suffren enters active service
The French Navy says the first Suffren-class boat entered active service on 1 June 2022, enabling Rubis to complete its final mission before withdrawal.
Sources: Un nouveau et dernier commandant pour le SNA Rubis

Documented Operational Roles

Public sources describe the class mainly through covert maritime tasks rather than public weapon firings.

Role	Documented context	Conflict or operation
Area denial	Rubis-class submarines rotated near the mouths of Kotor and inhibited Serbian naval movement.	1999 Kosovo War / Operation Allied Force
Carrier task-force protection	Rubis protected Task Force 473 during the French naval component of operations off Afghanistan.	2001 War in Afghanistan
Intelligence and surveillance	Rubis was one of three French SNA that rotated on intelligence missions off Libya; official bulletins list multiple Rubis-class crews in Harmattan.	2011 First Libyan Civil War
Fleet escort	AP reported a remaining Rubis-class submarine preparing to escort Charles de Gaulle during a NATO-commanded Mediterranean operation in 2024.	Neptune Strike training activity