--- title: "Royal Navy’s Last Nuclear Attack Submarine Of The Cold War-Era Heads Into Retirement" description: "The U.K. Royal Navy has formally withdrawn [HMS *Triumph*](), the last of its *Trafalgar* class nuclear attack submarines (SSN), which were widely regarded as some of the best of their kind across a long and active period of service starting…" date: "2025-07-21" modified: "2025-07-21" authors: - name: "Thomas Newdick" job_title: "Staff Writer" link: "https://www.twz.com/authors/thomas-newdick" url: "https://www.twz.com/news-features/royal-navys-last-nuclear-attack-submarine-of-the-cold-war-era-heads-into-retirement" categories: - "Around The Globe" - "Europe" - "Naval History" - "Navies" - "News & Features" - "Nuclear Attack Submarines (SSNs)" - "Royal Navy" - "Sea" - "Submarines" - "United Kingdom" --- # Royal Navy’s Last Nuclear Attack Submarine Of The Cold War-Era Heads Into Retirement ![Image of HMS TIRELESS at sea. HMS Tireless is over 25 years old but still playing a vital role in the front-line Fleet. HMS Tireless is the third of the seven Trafalgar-class submarines built at Barrow by Vickers. She was launched on 17 March 1984, so she has been plying her trade in the Royal Navy for more than a quarter of a century, but a lengthy overhaul of her propulsion, weapons systems and sensors put her in good shape for the gruelling programme of training and trials which followed.]() *Crown Copyright* The U.K. Royal Navy has formally withdrawn [HMS *Triumph*](), the last of its *Trafalgar* class nuclear attack submarines (SSN), which were widely regarded as some of the best of their kind across a long and active period of service starting in the early 1980s. Known as ‘T-boats,’ the class of seven hunter-killers has now been fully superseded by the *Astute* class, which you can read more about [here](), and [plans]() are already being drawn up for the latter's successors. The Royal Navy announced today that it had decommissioned the last operational T-boat, with the ceremony marking the end of service for HMS *Triumph* taking place last week at HM Naval Base Devonport, in Plymouth, England. https://twitter.com/RoyalNavy/status/1947287950296842314 ![]() *December 2024: HMS *Triumph* leaves HM Naval Base Clyde for the last time in its three-decade-long career, before making the journey to Devonport in Plymouth, where a decommissioning ceremony took place last week. *Crown Copyright** A parade included submariners from *Triumph* as well as from [HMS *Talent*](). Although the latter boat was decommissioned three years ago, it still has a crew as part of the complex decommissioning process, something you can read more about [here](). Developed as the successor to the previous [*Swiftsure* class](), the T-boats were built by Vickers Shipbuilding and Engineering in Barrow-in-Furness, England, with the first example, HMS *Trafalgar*, being completed in 1983. There followed *Turbulent*, *Tireless*, *Torbay*, *Trenchant*, *Talent*, and finally *Triumph*, which was commissioned in 1991. ![]() *HMS *Trenchant* breaks through the ice of the Arctic Ocean during Ice Exercise 18. *Crown Copyright** Each boat was 280 feet long, with a displacement of 5,300 tons when submerged. Powered by a Rolls-Royce pressurized water nuclear reactor, the T-boats could reach a submerged speed of at least 32 knots, driven by a pump-jet propulsion system. The armament consisted of five 21-inch torpedo tubes for up to 30 [Spearfish]() heavyweight torpedoes, to which were later added UGM-109 [Tomahawk Land Attack Missiles]() (TLAM), with a range of over 1,200 miles. The original primary Cold War mission of the T-boats was to provide protection for the U.K.’s [strategic nuclear deterrent](), ensuring that the Trident-armed ‘bombers’ (as they are called in British parlance) were able to evade Soviet anti-submarine assets, especially hunter-killer subs. Intelligence-gathering was another very important Cold War mission. ![]() *HMS *Talent* conducting drills in the Kyle of Lochalsh, Scotland, in December 2009. *Crown Copyright* PO PHOT GAZ ARMES* However, the end of the superpower standoff saw the T-boats taking on new roles — and finally going to war. Among the highlights of *Triumph*’s service was a 1993 [voyage to Australia](), which saw the boat remain submerged while covering a distance of 41,000 miles, the longest solo deployment by any British nuclear submarine. *Trafalgar* class submarines launched TLAMs during successive campaigns in Afghanistan, Iraq, and Libya. When HMS *Trafalgar* took part in the 2001 strikes against al-Qaeda and Taliban forces in Afghanistan, it became the first of its class to launch Tomahawk cruise missiles in combat. *Triumph* subsequently also took part in that operation. ![]() *A Tomahawk Land Attack Missile (TLAM) being fired from a Royal Navy submarine in 2000. *Crown Copyright** In 2003, HMS *Turbulent* took part in Operation Telic, the U.K. contribution to the invasion of Iraq, returning to its base [flying the Jolly Roger]() after launching 30 TLAMs. HMS *Triumph* was involved in TLAM strikes against Libya in 2011, primarily striking air defense targets. The boat also returned to Devonport with the Jolly Roger raised and with six markings indicating the launch of six Tomahawk missiles. ![]() *Britain’s Royal Navy Commander Rob Dunn holds a Jolly Roger flag on *HMS Triumph* as the boat sails back into Davenport, on April 2, 2011, after taking part in operations in Libya, where it fired six Tomahawk cruise missiles. *AP** Four of the boats were eventually fitted with the [Type 2076]() sonar, which the Royal Navy [describes]() as the most advanced of its kind in service anywhere. It is also used in the more modern *Astute* class. Other new sensors were added, too. In the past, we detailed some of the changes made to HMS *Talent*, specifically, including [two versions]() of an apparent wake-detection system, [characterized by curious protrusions]() on either side of its sail. The system, which first appeared on the boat in 2019, was designed to detect hostile subs without using sonar. ![]() *HMS *Talent* in the Bay of Gibraltar on May 8, 2019. The apparent non-acoustic sensor system is visible on top of the front of the hull. *DM Parody** ![]() *A close-up of the revised sensor arrays on the sail of HMS *Talent*, as they appeared in 2021, as well as two L7 machine guns. *DM Parody 2021** After the Cold War, the T-boats also increasingly assumed a role as covert platforms for launching commando raids. Throughout, the many aspects of their missions remained highly classified, as they had been in Cold War times. “Are there any interesting stories I can tell? No, we did a lot of missions which we cannot talk about,” [said]() former nuclear engineer Craig Spacey, who served in *Trenchant* and *Torbay*. As time went on, however, the T-boats, for all their capabilities, began to show their age. Collectively, the T-boats amassed more than 200 years of service, with *Triumph* having the longest career of all of them, at 34 years. ![Trafalgar Class Fleet Submarine HMS Turbulent is pictured with the Merlin helicopter from Type 23 frigate HMS St Albans, during an anti-submarine exercise in the Gulf of Oman. The ship tested sonar ranges, radar ranges and lookouts during the exercise also involving HMS Turbulent and a small number of foreign vessels.]() *HMS *Turbulent* is pictured with the Merlin helicopter from Type 23 frigate HMS *St Albans*, during an anti-submarine exercise in the Gulf of Oman. *Crown Copyright* Simmo Simpson* In 2000, it was reported that only one boat, *Triumph*, was fully operational, but subsequent refits appeared to address these problems and increase availability. Most significantly, in terms of accidents, two weapons engineers [were killed]() in an explosion aboard HMS *Tireless* in 2007, during an Arctic patrol. Starting in 2009, with the arrival in service of the first of the *Astute* class submarines, the *Trafalgar* class was gradually phased out. Nearing completion at Barrow is HMS *Agamemnon*, which will replace HMS *Talent*, while *Triumph*’s duties will ultimately be taken up by the final *Astute* class boat, HMS *Achilles*, later this decade. ![]() *HMS *Ambush* returning to HMNB Clyde on the Clyde estuary in Scotland. *Crown Copyright** Beyond that, the United Kingdom is looking at building up a larger SSN force, starting in the late 2030s, with [plans]() to field as many as 12 examples of a new design, to be developed under the [SSN-AUKUS]() program in collaboration with Australia and the United States. The fate of the T-boats after their service now includes scrapping. This is a process that the United Kingdom has only recently started for its decommissioned nuclear-powered submarines, with HMS *Swiftsure* becoming the first to be cut up as part of its scrapping process. You can read more about this [here](). Although now consigned to history, the *Trafalgar* class will be remembered for its versatility, adapting to changing security situations and serving as the workhorses of the Royal Navy’s submarine flotilla for more than four decades between them. ![Royal Navy submarine HMS Talent conducts surfacing drills in the Kyle of Lochalsh, Scotland in December 2009.]() *HMS *Talent* conducts surfacing drills in the Kyle of Lochalsh, Scotland, in December 2009. *Crown Copyright* PO PHOT GAZ ARMES* “They are the last of the Cold War warriors, although the Cold War never went away,” [said]() Capt. Dave Burrell, former executive officer of both *Talent* and *Triumph*, as he referred to the [continued underwater standoff with Russia](). “We continued to play our dangerous game,” he reflected. Describing the first time he stepped aboard HMS *Tireless* in 2003, Burrell recalled: “The boat was a marvel, the people inspiring, and the mission was challenging.” “I asked the Royal Navy’s most senior submariners how I should describe the *Trafalgar* class,” Burrell concluded. “They said simply: utterly brilliant submarines.” *Contact the author: thomas@thewarzone.com* ## Author Thomas Newdick is a staff writer at *TWZ*, where he covers military aviation, defense technology, weapons systems, and international security. Based in Berlin, Germany, he reports on conflicts, military modernization efforts, and emerging aerospace technologies around the world, with a particular interest in airpower and its role in contemporary warfare. His reporting is informed by deep expertise in modern and historical airpower, particularly in Europe, with a focus on military aviation, air campaigns, and aerospace developments across the continent and beyond. Over a journalism career spanning more than 25 years, Thomas has become known for making complex defense and aerospace topics accessible to a broad audience. His reporting combines technical expertise, historical context, and a focus on the real-world operational and strategic implications of military developments. ### Author social links [Twitter]()