MSubs Timeline

Events

• 2026-06-25 - Contract Award - MSubs receives UK SDA trial contract for CETUS XLUUV - The trial phase covers CETUS payload testing, underwater-autonomy de-risking and military-utility evaluation. XV Excalibur is the Royal Navy XLUUV developed through Project CETUS with MSubs. GOV.UK describes Excalibur as a 12 m, 19 tonne extra-large uncrewed… - source: ukdefencejournal.org.uk
• 2025-12-11 - Production Milestone - MSubs-built XV Excalibur handed over to Royal Navy - XV Excalibur is a 12-metre, 19-tonne extra-large uncrewed underwater vehicle. The vehicle was developed by the Submarine Delivery Agency in partnership with MSubs under Project Cetus. Acceptance trials followed its February 2025 launch and preceded Royal… - source: gov.uk
• 2025-12-03 - Partnership - Li-S Energy and MSubs launch UUV battery-testing collaboration - MSubs will provide a specialised pressure-test chamber for trials at Li-S Energy's Geelong facility. The initial programme covers submarine-depth pressure and endurance testing designed to simulate multi-day deployments. Only if the trials succeed will the… - source: announcements.asx.com.au
• 2022-03-08 - Partnership - MSubs and Sonardyne advance autonomous naval-platform capabilities - XLUUV manufacturer MSubs and Sonardyne have signed a strategic partnership to advance autonomous underwater platforms for UK defence. In 2021, MSubs and Sonardyne took part in the first phase of the UK’s Defence and Security Accelerator’s (DASA) Uncrewed… - source: sonardyne.com
• 2020-03-05 - Contract Award - MSubs wins Royal Navy XLUUV test submarine contract - The project converted an existing crewed submersible with autonomous control systems. The program explored larger uncrewed underwater vehicles for surveillance, reconnaissance and anti-submarine warfare. - source: gov.uk