Anglo-French MMCM programme

The Anglo-French Maritime Mine Counter-Measures programme reached its first at-sea operational milestone in early June 2026 when RFA Lyme Bay called at Toulon and embarked the French Navy's Sirius USV alongside the Royal Navy's RNMB Ariadne, both systems built under the programme's shared Thales sonar architecture. It is the first time either navy has operated autonomous mine-hunting systems from the same mothership in a deployment context rather than a harbour demonstration.

Launched in 2015 under the Lancaster House Defence and Security Co-operation Treaty, the programme pools post-2008 budget constraints across both nations. Thales acts as common sonar integrator, supplying SAMDIS synthetic-aperture sonar to Ariadne and the equivalent system to Sirius; each nation retains its own platform prime (BAE Systems and L3Harris UK for Ariadne's hull, Thales for Sirius). That shared sonar layer is what makes interoperability technically tractable: the challenge at Toulon was data-link and control-station integration, not sensor hardware.

A working at-sea combined package gives Thales an export reference no demonstration ashore can replicate. Japan's MSDF, South Korea, Singapore, and Australia have each stated autonomous MCM requirements through 2030; the Lyme Bay integration positions the Anglo-French toolkit as the only operationally validated bilateral autonomous MCM offer in the market. The mission context is the Hormuz closure, though mine clearance has not yet been conducted as of 13 June 2026.