US and UK navies test American torpedo on British robotic submarine
The US Navy and Royal Navy launched an American Mk 48 heavyweight torpedo from a British autonomous submarine during testing in Scotland on September 13, 2026.
Test location and timing
The launch occurred at the British Underwater Test & Evaluation Centre. This event marked the completion of the first weapon integration test for Project Broadsword after seven months of work.
Weapon mounting details
Engineers attached the 3,700-pound Mk 48 torpedo externally beneath the XV Excalibur hull. The trial examined whether an American weapon could integrate with a British autonomous underwater vessel through compatible systems.
AUKUS partnership context
Project Broadsword operates under AUKUS Pillar II, which focuses on sharing advanced capabilities like artificial intelligence and autonomy. This cooperation involves Australia, the United Kingdom, and the United States developing interoperable undersea technologies.
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