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France Conducts First U.S. Razorback UUV Deployment from Suffren-Class Submarine.
A French Navy Suffren-class nuclear attack submarine deployed and recovered a U.S.-built Razorback unmanned underwater vehicle off Toulon in March 2026. The trial marks a key step toward integrating autonomous systems into allied submarine operations and strengthening U.S.-France undersea interoperability.
The activity, conducted between March 16 and 20, involved a Suffren-class nuclear attack submarine designed by Naval Group, operating the Razorback UUV from a submerged platform for the first time. The Razorback, derived from Boeing’s Echo Voyager lineage and adapted for submarine launch and recovery, is designed for long-endurance intelligence, surveillance, and reconnaissance missions. The test highlights growing efforts by NATO navies to pair crewed submarines with autonomous systems, expanding undersea reach while reducing risk to high-value platforms.
The drone is deployed from a Dry Deck Shelter (DDS), a removable structure installed on the aft deck that is traditionally used to deploy combat swimmers and specialized equipment (Picture source: French MoD/ NavalGroup)
The trials consist of multiple launch and recovery sequences performed while the submarine remains submerged. The drone is deployed from a Dry Deck Shelter (DDS), a removable structure installed on the aft deck that is traditionally used to deploy combat swimmers and specialized equipment. During these operations, the Razorback also conducts oceanographic measurements, illustrating its dual-use potential in both military and environmental data collection. The objective is to assess how such systems can be used in real operations, beyond experimental frameworks.
The French Ministry of Armed Forces confirmed on 31 March 2026 that the drone operated autonomously once deployed, executing its mission profile before returning to the submarine. Recovery procedures were conducted under diver supervision, highlighting both the technical complexity of submerged handling and the fact that fully autonomous recovery remains under refinement. This sequence, combining launch, mission execution, and recovery, constitutes the core achievement of the trial, validating the ability of a French nuclear-powered attack submarine to act as a host for autonomous systems while maintaining discretion.
This is a first for France, even though similar demonstrations have already been conducted by the U.S. Navy, notably with USS Delaware under the Yellow Moray program. The French approach differs in its reliance on a DDS rather than torpedo tubes, offering greater flexibility in payload integration but requiring more complex handling procedures. The test also relies on close cooperation with U.S. submarine forces, which shared technical data and recovery procedures, while French crews and the Direction générale de l’armement ensured operational design and technical validation.
The Razorback corresponds to the militarized version of the Remus 620 developed by Huntington Ingalls Industries (Picture source: HII)
The Razorback corresponds to the militarized version of the Remus 620 developed by Huntington Ingalls Industries. Measuring approximately 3.20 meters in length, with a diameter of 32.4 centimeters and a displacement of nearly 240 kilograms, the drone remains compact while offering extended endurance. It can operate for more than 70 hours, depending on payload and reach depths of around 183 meters. Its modular architecture allows integration of advanced sensors such as the Thales SAMDIS 600 synthetic aperture sonar, which produces high-resolution seabed imagery and enables detection and classification of mines or objects in cluttered environments.
These characteristics directly support emerging requirements in seabed warfare and mine countermeasure operations. The drone can survey areas ahead of the submarine, reducing uncertainty without exposing the host vessel. Its endurance allows persistent data collection over extended periods, while its low acoustic signature limits detection risks. However, underwater communications rely on acoustic links with limited bandwidth, which constrains real-time control and requires a high level of autonomy.
The host submarine itself plays a central role in this evolution. The Suffren class, which replaces the Rubis class, represents a new generation of French nuclear-powered attack submarines. With a submerged displacement of approximately 5,300 tonnes and a length of 99.5 meters, it is powered by a K15 nuclear reactor delivering around 150 MW, coupled with an electrically driven pump-jet that enhances acoustic discretion. Its operational endurance is limited primarily by crew fatigue and logistics, typically around 70 days.
The submarine integrates a comprehensive sensor suite, including the Thales UMS-3000 sonar system with hull and flank arrays, a towed array sonar for long-range detection, and the SEACLEAR sonar for mine and obstacle avoidance. These systems allow detection, tracking, and classification of contacts across a wide spectrum of frequencies. Combined with the SYCOBS combat management system, they provide a high level of situational awareness in complex underwater environments. Armament includes F21 heavyweight torpedoes, Exocet SM39 anti-ship missiles, and MdCN land-attack cruise missiles, giving the submarine both anti-surface and strike capabilities.
Integrating a UUV such as Razorback into this architecture transforms the submarine into a distributed sensor node. Instead of relying solely on onboard sensors, the submarine can deploy external assets to extend its detection range and operate at distance. This reduces the need to approach contested areas directly, lowering the risk of counter-detection. The DDS further enables combined operations with special forces, allowing the drone to support reconnaissance of insertion zones or underwater routes before deployment of personnel.
This capability introduces a form of stand-off intelligence gathering. The submarine can remain concealed while the drone conducts reconnaissance, mine detection, or seabed mapping missions. It also enables persistent surveillance of maritime chokepoints or critical infrastructure such as undersea cables. At the same time, the reliance on diver-assisted recovery and the constraints of underwater communication highlight areas where further development is required to reach full operational maturity.
The integration of autonomous systems within nuclear-powered submarines points toward a more distributed and networked approach to maritime operations. For France, demonstrating this capability with a U.S.-origin system underscores both the depth of transatlantic cooperation and the intent to remain aligned with evolving operational standards.
Written By Erwan Halna du Fretay - Defense Analyst, Army Recognition Group
Erwan Halna du Fretay holds a Master’s degree in International Relations and has experience studying conflicts and global arms transfers. His research interests lie in security and strategic studies, particularly the dynamics of the defense industry, the evolution of military technologies, and the strategic transformation of armed forces.