Britain will lead the development and delivery of three advanced underwater payloads for uncrewed vessels under the AUKUS defence partnership with Australia and the United States, the Ministry of Defence announced on Tuesday 27 October.
The announcement follows a week of testing at the Maritime Big Play exercise in San Diego and identifies the three capabilities the UK will lead within an existing AUKUS Pillar II project.
Three technologies under UK leadership
The three payloads are Synthetic Aperture Sonar, designed to gather detailed underwater information; a Deployable Anti-Submarine Warfare Sensor, intended to help detect and classify underwater threats; and a Deployable Non-Kinetic Effector, intended to generate underwater effects without relying on conventional kinetic weapons. The Ministry of Defence has not published detailed technical specifications for the effector.
The systems are intended for uncrewed underwater vehicles, which can operate alongside ships and submarines. The Government says they could strengthen maritime surveillance and help protect vital underwater infrastructure, including seabed assets.
Availability planned from 2027
The Ministry of Defence says the payloads will be available across the three AUKUS partners’ uncrewed underwater vehicle fleets from 2027. That is a planned delivery milestone, not confirmation that the systems are already operational or deployed.
The wider AUKUS Pillar II signature project was announced in May 2026. Today’s development is the confirmation of the UK’s lead role in these three specific payloads, together with progress demonstrated during recent exercises.
San Diego testing and British industry
During Maritime Big Play-Pacific, the UK led the anti-submarine warfare strand and contributed 13 uncrewed surface vehicles, two anti-submarine warfare targets and four underwater gliders from six industry partners. The exercise tested cooperation between crewed and uncrewed systems from Australia, Britain and the United States.
The Ministry of Defence highlighted British companies SEA Ltd, based in Frome, and Decision Analysis Services Ltd, based in Basingstoke, among firms demonstrating technology. They are among four winners of an AUKUS Maritime Innovation Challenge sharing £3 million in development funding; the announcement does not say that this funding pays for all three newly identified payloads.
Why undersea security matters
The UK Strategic Defence Review identifies undersea cables, pipelines and offshore energy installations as critical infrastructure requiring stronger protection. The Royal Navy’s planned Hybrid Navy combines crewed platforms with autonomous and uncrewed systems to improve surveillance and response.
Minister for Defence Readiness and Industry Luke Pollard said British innovation was central to the partnership, while the Government presented the work as strengthening cooperation across the Euro-Atlantic and Indo-Pacific. Those are the Government’s assessments of the expected benefits, rather than evidence that the capabilities have completed operational acceptance.
Sources
Sources: Ministry of Defence announcement, 27 October 2026; AUKUS Pillar II project factsheet, 30 May 2026; UK Strategic Defence Review 2025.