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Yes. On 30 September 2026, the Royal Navy said its experimental uncrewed submarine XV Excalibur successfully launched and controlled an inert, recoverable US Navy Mk 48 Mod 4 heavyweight torpedo during a trial in Scotland. The announcement does not establish that a live warhead was used, that the system is operationally deployed, or that the Mk 48 is the world’s deadliest torpedo.
Did the UK fire a torpedo from a robotic submarine?
Yes—in a trial launch, not a reported combat firing. The Royal Navy announced that XV Excalibur, its experimental extra-large uncrewed underwater vessel (XLUUV), fired and controlled the torpedo at the British Underwater Test and Evaluation Centre (BUTEC), near Kyle of Lochalsh on Scotland’s northwest coast.
The experiment lasted three weeks. It was conducted by the Royal Navy with the US Navy, the UK Submarine Delivery Group Autonomy Unit, MSubs, which built Excalibur, and QinetiQ, which operates the test range. The Navy says the vessel and torpedo were not designed to be deployed together in this configuration; a specialist management system was used to fire and control the weapon. Royal Navy announcement, 30 September 2026.
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Which torpedo did the Royal Navy test from Excalibur?
It was a US Navy Mk 48 Mod 4 heavyweight torpedo—not the UK’s Spearfish. The Royal Navy describes the Mk 48 as nearly six metres long and weighing over 1½ tonnes. Those are approximate figures from the Navy’s announcement, not independent measurements published with the trial results.
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The announcement says the Mk 48 is designed to destroy adversary submarines and warships. It provides no comparative lethality data, performance figures, firing telemetry, range, speed, or targeting results that would support ranking it against other torpedoes.
Was the torpedo test live?
The Navy says the trial used an inert, recoverable version of the torpedo. It does not say a live warhead was used, so this should be described as a successful trial launch and control test—not a live-warhead attack.
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- Adjustable Robotic Arms: This submarine has a pair of robotic arms. One is a drill and the other is pliers. The two robotic arms can be flexibly extended and folded.
- Cabin Can be Opened: The cabin of this submarine model toy can be opened, and the interior space can be used to store other small toys, which is very useful. We only need to press the button at the top to open the cabin.
- Hands-on Skills Development: With this adjustable robotic arm, as well as an adjustable base, children can constantly change their shape while playing, thus developing their hands-on skills, imagination, and interest in scientific exploration.
- Cool Ornament: Although the submarine is a toy in its own right for kids, for adult, it can also be a nice ornament thanks to its cool shape.
What is XV Excalibur?
XV Excalibur is a 12-metre experimental XLUUV, meaning it is an extra-large uncrewed underwater vessel rather than a crewed submarine. The Royal Navy says it entered service in May 2025 and is being used to accelerate the adoption of advanced technologies.
The Excalibur test demonstrated an integration arrangement for this trial. The Navy’s announcement does not establish operational readiness or deployment of a torpedo-launching uncrewed vessel.
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What does the trial mean for AUKUS and future undersea warfare?
The Royal Navy associates the work with AUKUS Pillar 2, which focuses on rapid capability development, and names it Project Broadsword/Trial Iron. The Navy says the aim was to demonstrate an uncrewed system capable of undersea-warfare operations without risking personnel.
The Navy describes this as the first launch in a series of US-initiated trials expected to grow in scope and complexity, with the eventual aim of putting torpedo-launching uncrewed vessels on operations around the world. That is a stated future ambition, not evidence that the capability has already been fielded.
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First Sea Lord General Sir Gwyn Jenkins called the trials “a pivotal moment for AUKUS” and said they show what the UK, Australia and the United States can achieve together. Lieutenant Commander David Iwanek, the UK trial director, said the achievement “paves the way for a step change in underwater lethality.” These are statements by officials involved in the programme, not independent assessments of the trial’s military impact.
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No. “World’s deadliest” is not substantiated by the Royal Navy’s announcement. It identifies the weapon as a Mk 48 Mod 4 and describes its intended targets, but publishes no comparative ranking or evidence establishing that it is deadlier than other torpedoes. The trial concerns launching and controlling this weapon from Excalibur; it is not a comparative test of torpedo lethality.
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