France has test-fired its new M51.3 nuclear-capable ballistic missile for the first time from a submarine.
The missile, the third variant of the M51 sea-launched ballistic missile, was fired from the nuclear-powered ballistic-missile submarine Le Vigilant and impacted in the North Atlantic, “hundreds of kilometers from any coastline,” the defense ministry said.
President Emmanuel Macron watched from a French warship. The Direction générale de l’armement tracked the flight, including with the trials ship Monge.
“The launch was conducted without a nuclear warhead and in strict compliance with France’s international commitments,” the ministry said. It called the shot proof of “the excellence of the high-tech solutions employed by French industry in the field of nuclear deterrence.”
The M51.3, built by ArianeGroup, entered service on 24 October 2025.
An earlier flight, in November 2023, was from a land site.
À bord de la frégate multi-missions Auvergne, j'ai assisté au premier tir du nouveau missile balistique M51.3 depuis le sous-marin nucléaire lanceur d'engins Le Vigilant.
Très peu de nations disposent d'un tel savoir-faire.
Félicitations à tous les acteurs de cette réussite… pic.twitter.com/bElCe99hMd
— Emmanuel Macron (@EmmanuelMacron) October 6, 2026
French President Macron wrote on X (translated): Aboard the multi-mission frigate Auvergne, I witnessed the first firing of the new M51.3 ballistic missile from the nuclear-powered ballistic missile submarine Le Vigilant. Very few nations possess such expertise. Congratulations to all the players in this exceptional achievement: DGA, CEA, Ariane Group, Naval Group, and the French Navy.
Your professionalism, your rigor, and your technical mastery are the pride of France. This technical success is a new demonstration of the credibility of our deterrence, whose sustainability is assured. To be free, one must be feared. And to be feared, one must be powerful. To protect the French in the long term against threats, I launched the renewal of our capabilities for the decades to come as early as 2017. In ten years, the budget for our armed forces will have doubled.
Our future strategic submarines are currently under construction. This year, we launched the program for hypersonic and maneuverable strategic missiles, which will equip our airborne deterrence component. Our nuclear deterrence protects us and will continue to protect us. Long live the Republic, and long live France.
Tuesday’s firing was the first from a submarine, and it closed Le Vigilant’s requalification after a long refit. A navigation warning had closed a box southwest of Penmarc’h from 5 to 21 October. Witnesses at Penmarc’h reported the missile leaving the water shortly after 09:10, with a contrail and a sustained rumble.
Open-source figures put the M51 at about 12 meters, 2.3 meters in diameter and roughly 52 tonnes, with three solid stages, an estimated range of 8,000 to 10,000 km and a speed near Mach 20.
The M51.3 carries the newer TNO-2 oceanic warhead. Analysts usually cite four to six independently targetable warheads of about 100 kilotons, plus penetration aids. Paris says the variant has better range, accuracy, and ability to defeat missile defenses. Exact figures remain classified.
The missile arms the four Triomphant-class submarines, one of which remains at sea as part of France’s continuous deterrent.
A follow-on, the M51.4, was contracted to ArianeGroup in September 2025. The next submarine class, SNLE 3G, had its first steel cut in March 2024, with the first boat aimed at the mid-2030s.
The test comes as Macron has warned of a change in “Russian aggression and threats” after a run of hybrid attacks blamed on Moscow, and has said those actions would “not go unanswered.” He has also offered European partners a role in France’s nuclear deterrent, the only one in the European Union.
M51
According to Ariane Group, the M51 sea–surface submarine-launched ballistic missile is a solid-propellant, three-stage launcher weighing over 50 metric tons and measuring 12 meters long. Each of the FOST’s SSBNs carries 16 missiles, capable of delivering their payload over intercontinental distances of several thousand kilometers.
Launched from a submarine, the M51 travels through the Earth’s atmosphere into space, reaching an altitude of more than 2,000 kilometers, well beyond low-Earth orbit.
It then re-enters the atmosphere at Mach 20. The M51 is a concentration of space technologies combining power, precision, and reliability. Because deterrence credibility depends on its permanent availability, the system must be fully ready at all times.
Commissioned at the end of 2010, the M51 is the fifth generation of French ballistic missiles.
The missile is developed in increments to respond effectively to changes in the geostrategic context and France’s requirements. This means ArianeGroup, Europe’s only company capable of designing and producing a strategic missile, must stay at the cutting edge of technology and maintain the highest performance.
The M51.2 is the current in-service version.
It will be succeeded by the M51.3 version, which successfully carried out its qualification flight without a nuclear warhead.
With AFP Inputs
