On September 13, 2026, the U.S. Navy and the British Navy conducted a successful test of the Mk 48 Heavyweight torpedo using the unmanned underwater vehicle XV Excalibur. This test was aimed at assessing new operational capabilities and enhancing the security of underwater infrastructures in the Atlantic. The Mk 48 torpedo is recognized as the primary weapon of the U.S. Navy in anti-ship and anti-submarine operations, with guidance capabilities available in both acoustic search and wire guidance modes.
Details of the XV Excalibur Torpedo Test
The XV Excalibur vehicle, described as an unmanned underwater vehicle measuring 12 meters and weighing 19 tons, was built by MSubs Ltd in the UK. It was delivered to the Royal Navy in May 2025 and is currently undergoing testing in collaboration with the UK Submarine Development Agency. On September 16, this vehicle was spotted at the docks of Kyle of Lochalsh in northwest Scotland, and it is likely that the test was conducted within the range of the UK Ministry of Defence's torpedoes.
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Advanced Technologies and Their Implications
One of the unique features of the XV Excalibur is its optical quantum clock, which enables precise navigation over long durations. This technology allows the system to successfully carry out covert and long-term missions. The recent test was conducted under Pillar 2 of the AUKUS agreement, designed as part of a trilateral cooperation to enhance operational capabilities against underwater threats. This test demonstrates that AUKUS cooperation is not limited to the Indo-Pacific region and also addresses threats in the Atlantic.
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