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# Royal Navy names first extra large uncrewed submarine Excalibur
- URL: https://sovereigntymonitor.eu/news/2025-05-15-royal-navy-excalibur-xluuv-named/
- Published: 2025-05-15T12:00:00.000Z
- Updated: 2026-10-22T04:00:41.000Z
- Description: The Royal Navy formally named its first extra large uncrewed underwater vehicle, XV Excalibur, at HMNB Devonport, the result of the three year Project Cetus. Built by Plymouth's MSubs, it joins the Fleet Experimentation Squadron for trials.
- Author: Reidar Balstad
- Tags: Defence and space, #news, #reported, #ai-drafted

Reported AI-drafted [Naval News, 15 May 2025](https://www.navalnews.com/naval-news/2025/05/royal-navy-names-cetus-xluuv-after-excalibur/?ref=sovereigntymonitor.eu)

**What it does not test.** It does not show the vehicle is operationally deployed, only that it was named and handed over for trials.

**How this item counts.** This item is dated before the index starts on 1 January 2026, so it does not count in the [European Sovereignty Index](https://sovereigntymonitor.eu/sovereignty-index/).

**How this item was made.** Drafted by an AI system (Claude (Anthropic)) from the source cited above and published under the editor’s responsibility without a person reading it first. [How the record is made](https://sovereigntymonitor.eu/method/#how-the-record-is-made)