RNMB Ariadne

RNMB Ariadne is the Royal Navy's autonomous minehunter, a 12-metre crewless boat fitted with Thales Towed Synthetic Aperture Multiviews (TSAM) sonar for locating mines and a remotely operated neutraliser for destroying them, so no sailor needs to sit above a live mine during clearance. On 27 May 2026 Ariadne docked inside the RFA Lyme Bay support ship off Gibraltar on its first attempt, the first time the Royal Navy has recovered an uncrewed minehunter into a mothership at sea. In early June 2026, Lyme Bay called at Toulon and embarked the French Navy's Sirius USV alongside Ariadne, the first time both nations' autonomous MMCM systems operated from a single mothership in a deployment context, with Commander Dan Herridge describing it as "bringing together people, platforms and technology at short notice". Oman then authorised the UK and France to begin clearing mines on its southern Hormuz route shortly before 7 July 2026, but a tanker attack that same day set the timeline back before Ariadne's clearance run could start.

Ariadne operates within the wider Anglo-French Maritime Mine Countermeasures (MMCM) programme, with Thales as programme lead and a £184 million UK share. The mothership-recovery milestone is the critical engineering proof that Future Mine-hunting Capability depends on: launching an uncrewed boat is routine; recovering a 12-metre vessel into a moving dock on the first attempt in open water, and then integrating an allied system at the same time, proves the package that makes autonomous MCM operationally viable at Coalition scale. The same force package now also draws on Project Beehive: Kraken Technology Group's K3 SCOUT USVs, sailing alongside Ariadne, completed the world's first extracted-load USV airdrop from an A400M on 8 July 2026, giving the Royal Navy a second, faster way to put mine-hunting hulls on station.

The deployment toward Hormuz is described by the Royal Navy as strictly defensive, aimed at restoring commercial shipping confidence. Mine clearance operations had still not begun as of the tanker attack that followed Oman's authorisation on 7 July. Ariadne's deployment represents the Royal Navy's autonomy doctrine in practice: "crewed where necessary, uncrewed wherever possible, integrated always".