The Astute class is the Royal Navy’s nuclear-powered attack submarine: a boat designed to find and track threats underwater, protect naval forces, gather intelligence and strike targets at sea or on land. Its reactor supplies power for propulsion and electricity, while sonar, video-based observation and a combat-management system help the crew interpret its surroundings and act. It is nuclear-powered, but conventionally armed—not part of the UK’s Trident nuclear-deterrent fleet.
What the Astute class is built to do
Astute is a fleet of nuclear-powered, conventionally armed attack submarines. The Ministry of Defence says the class can detect, track and destroy enemy forces at sea, covertly strike land targets, protect task groups, support special forces and gather strategic intelligence. Its boats also serve in UK, NATO and coalition operations. The Defence Nuclear Enterprise 2026 Annual Update sets out those roles.
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“Nuclear-powered” describes the source of energy for the submarine; it does not mean the boat carries nuclear weapons. Astute’s publicly identified weapons are Spearfish heavyweight torpedoes and Tomahawk land-attack cruise missiles. The Royal Navy’s other nuclear-powered submarine class, Vanguard, carries Trident nuclear missiles as part of the UK’s nuclear deterrent. The Ministry of Defence’s submarine overview distinguishes the classes and their roles.
How its nuclear propulsion works
Astute uses a pressurised-water reactor (PWR). At the public, high-level description provided by the Ministry of Defence, nuclear fission heats water to produce steam; the steam drives the engines and also generates electricity. The official sources do not publish the detailed reactor arrangement or drive-train design. The Ministry of Defence’s overview describes the basic process.
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Unlike a conventional diesel-powered submarine, a nuclear-powered boat does not need to surface to obtain atmospheric oxygen for its propulsion system. The Royal Navy and builder BAE Systems say Astute can produce oxygen and drinking water onboard, helping it remain submerged for extended periods. That does not make patrol duration unlimited: BAE gives a typical dived endurance of 90 days, constrained by food supplies and crew endurance. The Royal Navy’s class page says the boats can circumnavigate the globe submerged; BAE Systems’ class facts gives the endurance figure and its limits.
How it senses and interprets its surroundings
Video-based surface observation
Astute was the first Royal Navy submarine class without traditional optical periscopes, according to the Royal Navy. Instead, high-specification video technology scans the horizon. The Ministry of Defence’s 2010 commissioning announcement describes the electro-optical equipment as providing a 360-degree image for the commanding officer to analyse. This is remote video or electro-optical observation, not a conventional optical periscope viewed directly through an eyepiece. The current Royal Navy class page and the 2010 announcement describe the system.
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Sonar for underwater detection
The class uses Sonar 2076, which the Royal Navy describes as an integrated active-and-passive search sonar suite with hull and towed arrays. Sonar supports detection and tracking underwater, but there is no single public detection distance that applies in every situation. The current class page names the suite without publishing a range; actual detection depends on circumstances.
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From sensor data to decisions
Astute’s Command and Control System receives information from onboard and external sensors, compiles an integrated tactical picture, presents information to command and manages weapon firing and control. The Royal Navy describes it as a network of systems that exchanges data over the Combat System Network, with SMCS identified as the command’s primary combat-management tool. In practical terms, sensors collect information, the system organises and presents it, and the crew makes operational decisions. The Royal Navy’s equipment page describes these functions.
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Weapons and missions
Public sources identify two principal weapon capabilities:
- Tomahawk Land Attack Cruise Missile: the Royal Navy says it can strike land targets far inland. The Navy also describes the missile as capable of being retargeted in flight and returning battlefield images.
- Spearfish heavyweight torpedo: the Royal Navy says it can be guided by wire or by its onboard sonar.
These are class capabilities, not a statement that every submarine carries the same weapons on every patrol. The Royal Navy and Ministry of Defence describe Astute’s sea-warfare, land-strike and wider operational roles; the exact loadout for a particular mission is not established by those public descriptions. The Royal Navy’s class page and the Ministry of Defence overview describe the weapons.
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Size, speed and submerged endurance
The Royal Navy lists Astute boats at 97 metres long and 7,400 tonnes displacement, and gives 30 knots as the class speed figure. Those are the figures on its live equipment page, accessed 4 October 2026. A 2010 Ministry of Defence announcement instead said the submarine could exceed 20 knots underwater and noted that its top speed was classified. The public sources therefore differ in how they state speed; the exact top speed is not public. Royal Navy equipment page; 2010 Ministry of Defence announcement.
For endurance, BAE Systems gives 90 days as a typical dived period, limited by food and crew endurance, while the Royal Navy and BAE say the boats can make oxygen and drinking water onboard. These claims explain how the class can operate submerged for long periods; they do not mean that a boat can stay underwater indefinitely. BAE Systems’ class facts.
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How many Astute submarines are in service?
The Royal Navy’s live class page, accessed 4 October 2026, says the class will total seven boats. It lists HMS Astute, Ambush, Artful, Audacious and Anson as in active service, describes Agamemnon as having left Barrow for sea trials, and says Achilles is under construction. The Ministry of Defence’s 2026 annual update uses a different milestone for Agamemnon: it says the submarine was commissioned in September 2025 and then undertook further testing towards joining the in-service fleet. Commissioning, completion of trials and operational readiness are distinct milestones, so the two sources should not be collapsed into a single status claim. The annual update says construction on Boat 7 continues. Royal Navy class page; 2026 annual update.
What comes after Astute?
The Ministry of Defence identifies SSN-AUKUS as the planned nuclear-powered, conventionally armed successor to the Astute class. Its 2026 annual update describes the programme as in detailed design and long-lead work. The procurement quantity is expected to be decided before that phase ends in 2028, and the first Royal Navy boat is targeted for the late 2030s. These are programme plans, not guaranteed delivery dates. The 2026 annual update.
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