American and British forces sank a retired U.S. warship with missiles and a torpedo in a live-fire drill off Scotland, testing real ship-killing weapons and alliance combat readiness under open-ocean conditions.
Last Monday the 138-metre USS Klakring went to the bottom after several direct hits in the North Atlantic, about 170 miles off the Outer Hebrides.
Daily Mail reporting described the joint sinkex, short for sink at-sea live-fire training exercise, as part of Exercise Atlantic Thunder 2026, a U.S.-UK multi-domain event run on the QinetiQ Hebrides range.
Missiles from the USS Paul Ignatius, a torpedo from the USS Massachusetts, a naval strike missile from HMS Portland, and Sea Venom missiles from a Royal Navy Wildcat helicopter all struck the target. The hulk then sank roughly 6,000 feet to the seabed.
No injuries or other damage were reported. The operation stayed well clear of land under long-standing U.S. environmental rules that require sinkings at least 50 nautical miles from shore and in deep water, after hazardous materials are stripped from the hull.
Retired frigate became a live target after years in storage
The Klakring left active service in 2013. It spent years at the Philadelphia Naval Inactive Ship Maintenance Facility before tugs moved it down the Delaware River on 12 August, initially bound for Campbeltown on Kintyre and the Atlantic crossing that put it on the range.
Decommissioned hulls still serve a clear purpose. They let crews fire live weapons at a real warship structure instead of a computer simulation or a simple barge. That same fleet-management reality appears in other corners of the service, including plans for the USS Eisenhower’s retirement timeline.
A Ministry of Defence document circulated to industry last year framed Atlantic Thunder 26 as a development exercise first. Its stated aims were to validate Surface Warfare kill chains, build resilient kill webs, and deliver strategic messaging through kinetic demonstration off the Hebrides.
The same paper stressed that while technology could be shown and industry contributions noted, the priority remained accelerating capability delivery by clearing known blockers, not staging a pure showcase.
Royal Navy officers call the firings a clear capability test
HMS Portland’s principal warfare officer, Lieutenant Commander Louise Kirkaldy, pointed to one of the British weapons used.
"The successful firing of NSM marks a significant milestone for the Royal Navy, demonstrating our ability to deliver credible, modern maritime strike capability."
The naval strike missile can travel near supersonic speed and reach targets more than 100 miles away. Commander Dafydd Bryden, commanding officer of HMS Portland, put the larger point in plain terms.
"The opportunity to fire anti-ship missiles against a decommissioned warship is an important test of our warfighting capability. This engagement proved the effectiveness of these systems as well as the sailors and aircrew who operate them. We remain ready to fight and win at sea."
Lieutenant Commander Paul Atkins, the UK lead project officer for Atlantic Thunder, tied the results to the alliance itself.
"Atlantic Thunder 26 demonstrated the enduring strength of the UK-US alliance and the close partnership between the Royal Navy and the United States Navy. Operating together in a demanding environment, we showcased our ability to integrate seamlessly, share expertise and deliver a highly capable, interoperable maritime force."
Those statements land against a backdrop of other pressures on the force, from supply disputes reported around the USS Boxer to separate command decisions elsewhere in the fleet.
Live weapons and shared tactics still decide outcomes at sea
Atlantic Thunder gave both navies a rare chance to run full kill chains against a steel warship hull in open water. Crews practiced long-range missile shots, torpedo attack, and helicopter-launched Sea Venom strikes in the same serial, then watched the cumulative effect put the target on the bottom.
That kind of end-to-end practice cannot be fully replaced by simulators. It also sits alongside harder personnel stories that surface on long deployments, including welfare strains reported inside the Abraham Lincoln strike group and cases where sailors have chosen to leave after extended time at sea.
The exercise stayed focused on the weapons and the tactics. U.S. and UK units shared the range, the targeting data, and the after-action picture. The MoD paper had already told industry the event would remain a development serial first, aimed at clearing capability blockers rather than pure display.
Command accountability remains a live issue across the wider fleet, as seen when the Navy relieved the USS West Virginia’s commanding officer well before a normal tour ended. Training like Atlantic Thunder still measures whether the ships and crews that remain can deliver when ordered.
The Klakring now rests on the seabed under several thousand feet of North Atlantic water. The missiles and torpedo that put it there did exactly what the crews and the alliance needed them to do.
Hard power still has to be proven in salt water, not just briefed in conference rooms, and this sinkex did the proving.
