Astute-class submarine

Astute-class submarine. The Astute class represents the most advanced nuclear-powered attack submarines ever constructed for the Royal Navy. Designed to succeed the Trafalgar class, these vessels provide unparalleled stealth, sensor reach, and firepower for roles including anti-submarine warfare, intelligence gathering, and land attack. The programme, managed by BAE Systems Submarines, has been central to maintaining the United Kingdom's strategic underwater capabilities into the 21st century.

Design and development

The design phase, initiated in the 1990s following the 1998 Strategic Defence Review, aimed to create a submarine with significantly greater capabilities than its predecessors. Key objectives included enhanced stealth through advanced acoustic quieting, a new Rolls-Royce PWR2 nuclear reactor for improved endurance, and integration of the powerful Thales 2076 sonar suite. The project faced considerable technical and financial challenges, leading to delays and cost overruns that were scrutinized by the House of Commons Defence Select Committee. The design leverages lessons from the Vanguard-class ballistic missile submarine programme and incorporates a pump-jet propulsor for reduced acoustic signature. Major subcontractors included Babcock International and Rolls-Royce Holdings.

Construction and service history

Construction of the lead boat, HMS Astute (S119), began at the Barrow-in-Furness shipyard in 2001, with the First Sea Lord presiding over the keel-laying ceremony. The programme experienced significant delays, with HMS Astute (S119) commissioned in 2010, years behind schedule. Subsequent boats have been delivered at a steadier pace, with HMS Ambush (S120), HMS Artful (S121), HMS Audacious (S122), and HMS Anson (S123) entering service. The final two boats, HMS Agamemnon (S124) and HMS Agincourt (S125), are under construction. The class has been involved in major exercises like Joint Warrior and has conducted operational deployments globally, including to the Arctic and the South China Sea. HMS Astute (S119) made headlines in 2010 after running aground near the Isle of Skye.

Specifications

The submarines are approximately 97 metres long with a beam of 11.3 metres and a submerged displacement of around 7,800 tonnes. The nuclear propulsion plant, based on the Rolls-Royce PWR2 reactor, drives a General Dynamics electric motor connected to a pump-jet, enabling speeds in excess of 30 knots while submerged. Electrical backup is provided by MTU Friedrichshafen diesel generators. The vessels carry a crew of 98, with accommodations for 109, and are designed for patrols of up to 90 days. The sensor suite is dominated by the integrated Thales 2076 system, which includes both bow and flank arrays, alongside systems from Raytheon and Atlas Elektronik.

Operational capabilities

The primary role is anti-submarine and anti-surface warfare, utilizing Spearfish torpedoes and Harpoon missiles launched from six 21-inch torpedo tubes. A defining capability is the capacity to carry and launch up to 38 Tomahawk Block IV land-attack cruise missiles, providing a covert, long-range strategic strike option for the British government. The advanced sonar and combat system allows for simultaneous tracking of multiple contacts. Stealth is paramount, achieved through sound-absorbing anechoic tiles, isolated machinery mounts, and the quiet pump-jet. The boats also support special forces operations via a Dry deck shelter and have sophisticated ESM and ECM systems for electronic warfare.

Boats in class

All boats are named with the letter 'A' and are based at HMNB Clyde in Faslane. The commissioned vessels are: HMS Astute (S119) (commissioned 2010), HMS Ambush (S120) (2013), HMS Artful (S121) (2016), HMS Audacious (S122) (2020), and HMS Anson (S123) (2022). The two remaining boats under construction at Barrow-in-Furness are HMS Agamemnon (S124) and HMS Agincourt (S125), with expected delivery before 2030. The class will eventually be succeeded in the attack submarine role by the new SSN(R) design, while the Dreadnought class will replace the Vanguard boats in the nuclear deterrent role.

Category:Submarine classes Category:Nuclear-powered attack submarines