XV Excalibur

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Royal Navy Project Cetus extra-large uncrewed underwater vehicle, built by MSubs as a 12 m, 19 tonne autonomous submarine testbed.

XV Excalibur is the Royal Navy's Project Cetus extra-large uncrewed underwater vehicle, built by MSubs in Plymouth for the UK Submarine Delivery Agency and Royal Navy. Public UK Government material describes it as a 12 m, 19 tonne XLUUV, the largest uncrewed underwater vessel trialled by the Royal Navy, and a testbed for building trust in underwater autonomy and assessing military payloads and missions. Excalibur was named in May 2025, handed over to the Royal Navy in December 2025, and is scheduled for extensive sea trials. Reported mission areas include ISR, stealthy underwater experimentation, seabed warfare, anti-submarine warfare concepts, bespoke payload trials, and future crewed-uncrewed underwater teaming.

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UK Government and Royal Navy releases state XV Excalibur is a 12 m, 19 tonne Extra-Large Uncrewed Underwater Vehicle developed under Project Cetus by the Submarine Delivery Agency with MSubs. It is the largest uncrewed underwater vessel trialled by the Royal Navy, was named in May 2025, handed over in December 2025, and is intended to build trust in autonomy and assess military payloads and missions. GOV.UK also reports that Royal Navy operators controlled Excalibur in UK waters from a remote operations centre in Australia during Exercise Talisman Sabre, over 10,000 miles from Plymouth.