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

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  • 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 Project Broadsword, approved only seven months earlier.

It examined whether an American weapon could be integrated with a British autonomous underwater vessel through compatible mechanical, electrical and software systems.

AUKUS Pillar II sets the framework for Broadsword

AUKUS is a security partnership between Australia, the United Kingdom and the United States covering cooperation on advanced military capabilities.

Its second pillar, known as AUKUS Pillar II, focuses on developing and sharing...

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