GoKawiilUS, UK test Mk 48 torpedo launch from Royal Navy's XV Excalibur drone sub
The U.S. Navy and Royal Navy jointly fired an exercise Mk 48 heavyweight torpedo from the uncrewed submarine XV Excalibur on September 13 at Scotland's BUTEC test range. The trial, conducted under the AUKUS Pillar 2 partnership and dubbed Project Broadsword, confirmed that an American torpedo could be mechanically, electrically and digitally integrated into a British autonomous underwater vehicle.
GoKawiil's interpretation of the reporting above, not reported fact.
Adm. Daryl Caudle framed the test as proof that allied weapons and platforms can be made interchangeable, which could let US and UK forces mix and match torpedoes and drone submarines rather than relying on matched national systems. The rapid seven-month timeline from approval to live trial suggests AUKUS partners are prioritizing speed in fielding autonomous undersea capabilities, likely aimed at strengthening deterrence in the Indo-Pacific.
- First known launch of a US Mk 48 torpedo from a Royal Navy uncrewed submarine, XV Excalibur
- Conducted under AUKUS Pillar 2's Project Broadsword, approved in February 2026 and executed within seven months
- Demonstrates cross-national weapon and platform interchangeability among US, UK, and Australian defense partners
Source: tomshardware.com — Etiido Uko, 2026-09-27
Published there as: “U.S. and UK navies successfully launch 3,700-pound submarine-sinking torpedo from robotic drone submarine in historic first”
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