HMS Agamemnon leaves Barrow for sea trials

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HMS Agamemnon, the sixth of seven Astute-class attack submarines built for the Royal Navy, has left the BAE Systems shipyard at Barrow-in-Furness to begin sea trials: the final round of testing before she joins the fleet for active service.

The Ministry of Defence confirmed the milestone in an official news release. Known to her crew as "Awesome Aggie", the submarine will now go through an extensive trials programme before heading to her home port, HM Naval Base Clyde in Scotland, the headquarters of the UK's submarine service.

Key facts

  • Vessel: HMS Agamemnon (S124), the sixth of seven Astute-class attack submarines
  • Departed: BAE Systems shipyard, Barrow-in-Furness, on 25 September 2026
  • Phase: sea trials, the final testing stage before she joins active service
  • Displacement: 7,400 tonnes; Length: 97 metres
  • Propulsion: Rolls-Royce nuclear reactor, built in Derby, requiring no refuelling for the vessel's service life
  • Weapons: Heavyweight Spearfish torpedoes and Tomahawk IV land-attack cruise missiles with a range of more than 1,000 miles
  • Crew nickname: "Awesome Aggie"

What happened

HMS Agamemnon left Barrow on 25 September 2026 to begin sea trials, the stage at which a new submarine's propulsion, weapons, sensors and safety systems are put to the test at sea after construction and fitting out. Once her trials are complete, she will head for HMNB Clyde at Faslane.

The submarine

The MOD describes the Astute class as the largest, most advanced and most powerful attack submarines the Royal Navy has ever operated. At 7,400 tonnes and 97 metres long, Agamemnon is powered by a Rolls-Royce nuclear reactor built in Derby. The reactor never needs refuelling, so she will not require fuel replenishment for her entire service life, which gives her effectively unlimited range while at sea.

She carries heavyweight Spearfish torpedoes and Tomahawk IV land-attack cruise missiles able to strike targets more than 1,000 miles away. That gives her a conventional strike reach capable of shaping events ashore from far offshore.

The MOD sets out three principal roles: supporting the continuous at-sea deterrent, protecting maritime task groups, and supporting UK, NATO and coalition operations. Agamemnon joins five in-service sister boats (Astute, Ambush, Artful, Audacious and Anson). The seventh and final boat, HMS Achilles, is at an advanced stage of construction in Barrow.

A build more than a decade in the making

Agamemnon's keel was laid in July 2013. More than a decade passed between the start of construction and her first voyage from Barrow on 25 September 2026. She was rolled out of Devonshire Dock Hall in October 2024, commissioned into the Royal Navy by King Charles III in September 2025, and completed her first trim dive the following month.

Why it matters

Britain's attack submarines are among the most heavily tasked vessels in the fleet. They escort the aircraft carriers on deployment, protect the continuous at-sea deterrent, and run intelligence-gathering and covert missions for the UK and NATO.

Analysis: With six of the seven boats now in or approaching service, the submarine service is getting closer to the full complement it needs to sustain these commitments without overstretching crews and hulls. Every additional hull takes pressure off the rest of the flotilla.

There is an industrial angle too. The MOD says the UK's submarine industrial base is benefiting from £6 billion of Government investment over the Spending Review period, sustaining thousands of jobs. The Barrow workforce and supply chain that built Agamemnon are the same people and facilities that will build the Dreadnought-class ballistic missile boats and the future SSN-AUKUS attack submarines, and every Astute-class departure sustains the skills those programmes depend on.

Official statements

Prime Minister Andy Burnham said: "As one of the most advanced submarines ever built, HMS Agamemnon will play a major role in further boosting our security here at home and across NATO." He also paid tribute to the workforce: "Having seen first-hand the dedication and pride of the workforce in Barrow, and that of the thousands of people who work across our submarine supply chain in the United Kingdom, I know how much this milestone will mean to each and every one of them."

First Sea Lord General Sir Gwyn Jenkins said: "In an increasingly dangerous world, sea power remains fundamental to keeping our country and people safe. Our submarine fleet is essential to that effort, which is why I am delighted that HMS Agamemnon, the sixth of our Astute-class submarines, has now begun sea trials and will soon arrive at HMNB Clyde to join the fleet. She embodies the best of British engineering and the professionalism of our submariners and will be one of the most advanced submarines ever operated by the Royal Navy. As we continue to strengthen our warfighting readiness, HMS Agamemnon will play a central role in keeping the United Kingdom safe, contributing to NATO's collective defence and ensuring we are ready to lead, fight and win."

What happens next

Sea trials are a demanding phase. The submarine and her crew will test propulsion, weapons systems, sensors, communications and safety equipment in progressively more challenging conditions before the boat is accepted into full service and takes her place at HMNB Clyde alongside her sister boats. Attention in Barrow now turns further towards the seventh and final boat of the class, HMS Achilles, which remains at an advanced stage of construction.

Steve Timms, Managing Director of BAE Systems Submarines, said the departure "demonstrates the growing momentum underpinning our submarines business."

Conclusion

Agamemnon's departure from Barrow is the latest step in getting the Royal Navy's attack submarine force back to full strength. It is a vote of confidence in the industrial base at Barrow and across the UK supply chain, and a signal of intent about Britain's underwater contribution to NATO's collective defence. As "Awesome Aggie" begins her trials, the silent service moves one hull closer to the fleet it plans to field.

Sources

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