Vanguard-class submarine

These are huge boats under the sea. They use a special power to move. This power lets them travel very far. They can go around the world 40 times. They do not even need to stop for fuel.

The boats carry big missiles. These help keep the land safe. They are the largest boats of their kind.

New boats will take their place soon.

The Vanguard class is a group of four large submarines.

They work for the Royal Navy in the United Kingdom. These boats use nuclear power to move. This power comes from a reactor. A reactor is a machine that makes heat. This heat makes steam to turn engines. This way, the boats can travel very far. One boat could go around the world 40 times without stopping for fuel.

The Vanguard boats are very big. They weigh nearly 16,000 tonnes. Because they are so large, a special building called Devonshire Dock Hall was built to make them.

These submarines carry Trident II missiles. Each boat can carry up to 16 of these missiles. These missiles carry nuclear warheads. These weapons are used to keep the country safe. The Vanguard class will be replaced soon. New boats called the Dreadnought class will start working in the 2030s. These new boats will use new technology to stay at sea.

The Vanguard class is a group of four large submarines used by the Royal Navy. These vessels are known as nuclear-powered ballistic missile submarines. They serve a very important job for the United Kingdom. They carry the nation's nuclear weapons to help keep the country safe. This role is called a nuclear deterrent. This means the submarines are there to prevent conflict. The four boats in this class are HMS Vanguard, HMS Victorious, HMS altogether, and HMS Vengeance.

They are the only platforms the UK uses for its nuclear weapons today.

These submarines work using a special kind of engine called a nuclear reactor.

Specifically, they use the Rolls-Royce PWR 2 reactor. This reactor creates heat to make steam. The steam then turns engines called turbines to move the boat. This system is very efficient for long trips. One submarine could travel around the entire world 40 times without needing more fuel. To keep them running, a special 'Core H' reactor is added during long repairs. This ensures the boats do not need to refuel for the rest of their lives. They use a pump jet to move through the water at speeds over 25 knots.

Building these massive boats required a lot of planning and new buildings. The design process began in the early 1980s. Vickers Shipbuilding and Engineering helped with the detailed design. Because the boats were so huge, a special building was needed. Engineers built the Devonshire Dock Hall in Barrow-in-Furness just for this task. Margaret Thatcher laid the keel for the first boat, HMS Vanguard, in 1986. The first boat was launched in 1992 and began its service in 1993. The final boat, HMS Vengeance, was commissioned in 1999.

The Vanguard class is very large and carries many different tools.

Each submarine can hold up to 16 Trident II missiles. These missiles can carry nuclear warheads. The boats also have four torpedo tubes for other tasks. They use special sonar to 'see' underwater using sound waves. They have different types of sonar, like the Type 2054, to find things. They even have two periscopes with thermal cameras to look above the water. These tools help the crew navigate and stay safe while deep under the sea.

Even though these boats are very advanced, they will not stay in service forever. The Vanguard class is scheduled to be replaced starting in the early 2030s. The new group of submarines will be called the Dreadnought class. These new boats will use a new reactor called the PWR3. The government has already planned for this transition to keep the nuclear program going. Building these new boats will be a very large project. It is expected to cost about £31 billion over 35 years. This ensures the United Kingdom continues its sea patrols for many years to come.

The Vanguard class is a group of four nuclear-powered ballistic missile submarines (SSBNs) used by the Royal Navy. These massive vessels serve as the United Kingdom's sole platform for its nuclear weapons. This role is known as a nuclear deterrent, which is meant to prevent conflict. The class includes four specific ships: HMS Vanguard, HMS Victorious, HMS altogether, and HMS Vengeance. They are based at HM Naval Base Clyde, located west of Glasgow, Scotland. These submarines are scheduled to be replaced by the Dreadnought class starting in the early 2030s.

Each submarine operates using a specialized propulsion system. They use the Rolls-Royce PWR 2, which is a pressurized water reactor. This reactor generates heat to produce steam. This steam drives two GEC steam turbines. These turbines are linked to a single shaft pump jet propulsor. This setup allows the submarines to reach submerged speeds of over 25 knots. The system is incredibly efficient for long-distance travel. It is estimated that one submarine could circumnavigate the entire world 40 times without needing to refuel. During long-overhaul refit periods, a 'Core H' reactor is installed. This ensures the boats never require further refueling for the rest of their service lives.

The submarines are designed to carry a significant amount of weaponry. They feature 16 ballistic missile tubes. However, following a 2010 Strategic Defence and Security Review, the Royal Navy typically loads only eight of these tubes with UGM-133 Trident II missiles. These missiles can carry nuclear warheads, which are known as Holbrook warheads. These warheads use a Mark 4A aeroshell and have a yield of 100kt. While the boats are capable of deploying up to 192 independently targetable warheads (MIRVs), current operational levels are much lower. The submarines also carry four 21-inch torpedo tubes. These are used to deploy Spearfish heavyweight torpedoes against submerged or surface targets.

To navigate and detect objects, the class uses advanced sensory technology. They utilize the Thales Underwater Systems Type 2054 composite sonar. This is a multi-mode system that includes the 2046, 2043, and 2082 sonars. The Type 2043 is a hull-mounted active and passive search sonar. The Type 2082 acts as a passive intercept and ranging sonar. Additionally, a Type 2046 towed array sonar provides low-frequency passive search capabilities. For looking above the water, the boats carry two periscopes. These are the CK51 search model and the CH91 attack model. Both models include thermal imaging cameras and conventional optics to assist the crew.

The history of the Vanguard class began with the need to replace older vessels. In the late 1960s, the UK operated four Resolution-class submarines using US-built Polaris missiles. By the early 1980s, the government needed a replacement. On 24 January 1980, the House of Commons voted 308 to 52 to keep an independent nuclear deterrent. After examining several options, the UGM-96 Trident I was the favorite. However, the US accelerated the development of the improved Trident II system. In 1982, Prime Minister Margaret Thatcher requested the Trident II system. This led to an agreement where Britain made a 5% research and development contribution.

The construction of these submarines was a massive engineering undertaking. The Ministry of Defence designed the class in the early 1980s. Vickers Shipbuilding and Engineering (VSEL) handled the detailed design at Barrow-in-Furness. Because the submarines were so large, a special facility was required. Engineers built the Devonshire Dock Hall specifically for this purpose between 1982 and 1986. Margaret Thatcher laid the keel for the first boat, HMS Vanguard, on 3 September 1986. The first vessel was launched in 1992 and commissioned in 1993. The final boat, HMS Vengeance, was commissioned in 1999.

Significant investments were made to support the entire program. Extensive redevelopment occurred at HMNB Clyde and the Royal Naval Armaments Depot Coulport. Rosyth dockyard also underwent major changes. These upgrades included improved facilities for handling, storage, and engineering. The estimated cost for these redevelopments was £550 million. Looking toward the future, the government is preparing for the Dreadnought class. This new class will use a new PWR3 nuclear reactor. The Ministry of Defence estimates the cost for the replacement program at £31 billion. This includes a £10 billion contingency fund over a 35-year period. The new fleet is expected to begin operations by the 2030s.