IN Brief:
- Each new Dutch anti-submarine warfare frigate is planned to carry a 12-metre uncrewed surface vessel.
- The craft will deploy an adapted Thales FLASH dipping sonar for remote submarine detection and tracking.
- Dutch Naval Design will coordinate government, industry, university, and research partners through the USV Alliance.
Thales has started designing a 12-metre uncrewed surface vessel intended to operate from each of the Royal Netherlands Navy’s new anti-submarine warfare frigates. The craft will carry an adapted FLASH dipping sonar, allowing the frigate to place an underwater sensor away from its own position and widen the area under surveillance.
The Netherlands Ministry of Defence has authorised Dutch Naval Design to begin the vessel design while completing procurement of the sonar. Dutch Naval Design brings together Defence, industry, universities, and research organisations, with participating organisations working through a proposal known as the USV Alliance.
The programme involves more than installing an existing sonar package aboard a small craft. Thales Underwater Systems France’s Compact FLASH equipment must be adapted for operation from an uncrewed platform, while the vessel must accommodate the sensor, deployment machinery, power demand, control equipment, communications, and the handling arrangements required for operations from a frigate.
A dipping sonar is lowered into the water to search at a selected depth rather than remaining fixed to the hull. Moving that capability onto an uncrewed surface vessel separates part of the sensor chain from the frigate and allows operators to alter the geometry between the detecting platform, the host ship, and a suspected submarine.
The Dutch concept is intended to extend the frigate’s field of view without revealing its precise location through the position of the active sonar. The craft could be deployed forward or elsewhere within the operating area to detect and track submarines, increasing the distance between the sensor and the command platform.
That separation creates additional options, but it transfers critical functions into the network connecting both vessels. Sonar data must reach operators in a usable form, while command links must support navigation, sensor deployment, recovery, route changes, and safe responses to equipment or communications failures.
The programme will therefore depend as heavily on systems integration and data handling as on the vessel’s hull. The frigate’s combat system must combine information from the uncrewed vessel with tracks from onboard sensors, aircraft, other ships, and allied networks without creating unnecessary workload or conflicting information.
A 12-metre craft can carry a more substantial payload than a lightweight surface drone, but its size still imposes limits on endurance, stability, maintenance access, fuel, electrical generation, and deck handling. Designers must balance sonar performance and sea-keeping against the practical constraints of launching, supporting, and recovering the vessel repeatedly from a frigate.
Launch and recovery are likely to be among the most demanding parts of the concept. A craft that performs well once deployed may still provide limited operational value if it can only be handled in calm conditions or requires extensive intervention from the frigate’s crew.
Anti-submarine warfare places further demands on the system. Sonar performance changes with water depth, temperature layers, background noise, platform movement, and the relative positions of sensors and targets. An offboard dipping sonar can create a more flexible search pattern, but only when positioning, communications, and track data remain accurate enough for the wider force to act.
The USV Alliance allows several technical disciplines to be considered during the design phase. Naval architecture, sonar engineering, autonomy, communications, ship integration, testing, and operational experience must converge before the vessel can function as part of the frigate’s combat system rather than as a separate demonstrator.
Thales already supplies underwater sensing equipment for crewed naval platforms, but this programme moves the sensor into a distributed arrangement. Performance will be judged across the complete system — frigate, uncrewed vessel, sonar, communications links, mission software, operators, and support equipment.
The arrangement also creates an industrial route for Dutch organisations to participate in a capability attached to a major national shipbuilding programme. Their work could extend beyond hull production into autonomy, mission systems, naval handling equipment, testing, maintenance, and future modifications.
The announcement marks the start of design rather than the completion of a deployable vessel. The Ministry has not named the vessel builder, disclosed the delivery schedule, or described the qualification programme that will test the adapted sonar and its host platform.
Those decisions will determine whether the concept can progress from an alliance proposal into routine shipboard use. Extending sonar reach is technically credible; proving that the craft can be launched, controlled, supported, and recovered in operational sea conditions will decide whether it becomes an effective part of the frigate’s underwater warfare system.