US, UK Navy launch heavyweight torpedo from unmanned vessel in what the military calls 'a historic first for allied undersea warfare'

British XV Excalibur robotic submarine has now launched an American Mk 48 heavyweight torpedo

Project Broadsword completed its first weapon integration test in seven months

Engineers mounted the 3,700-pound Mk 48 torpedo externally beneath XV Excalibur’s hull

The US Navy and Royal Navy have launched an American Mk 48 heavyweight torpedo from the British XV Excalibur uncrewed submarine during testing in Scotland.

Held on September 13 2026, the launch took place at the British Underwater Test & Evaluation Centre under…