Dreadnought-class submarine (planned)

Dreadnought-class submarine (planned)
Name	Dreadnought-class submarine
Country	United Kingdom
Builder	Babcock, BAE Systems Submarines
Operator	Royal Navy
Ordered	2016
Laid down	2016 (programme start)
Commissioned	projected 2028+
Status	Planned / under construction

Dreadnought-class submarine (planned) The Dreadnought-class submarine is a planned class of ballistic missile submarines intended to replace the Vanguard-class submarine as the United Kingdom's strategic nuclear deterrent, operated by the Royal Navy and built by BAE Systems Submarines and subcontractors including Rolls-Royce plc and Babcock International. The programme forms a central element of the United Kingdom's continuous at-sea deterrent posture established by policy documents such as the 2015 Strategic Defence and Security Review and defended in debates in the House of Commons and discussions involving the Ministry of Defence and the National Audit Office. Development has been influenced by international partnerships, notably with the United States Navy and the Trident (UK) missile system provided under the Polaris Sales Agreement successor arrangements.

Development and procurement

Development and procurement trace to decisions made during the 2006 White Paper and subsequent reviews including the 2010 Strategic Defence and Security Review and the 2015 Strategic Defence and Security Review, with formal procurement contracts awarded following announcements by successive Prime Ministers and Secretaries of State for Defence. The programme involves major defence contractors such as BAE Systems, Rolls-Royce, Babcock International, and suppliers across the United Kingdom industrial base, and it has attracted oversight from the National Audit Office and scrutiny by select committees of the Parliament. Internationally, cooperation and technology exchange have involved meetings with representatives from the U.S. Department of Defense and industrial actors engaged with the Trident II D5 community.

Design and specifications

The class is designed around a large hull to accommodate 12 missile tubes, an advanced combat system, and weapons handling spaces influenced by prior designs such as the Vanguard-class submarine and lessons from the Astute-class submarine programme. Specifications include a displacement larger than the Vanguard-class submarine and internal arrangements to support a crew drawn from Royal Navy submarine branches and technical personnel trained at establishments like HMS Raleigh and HMS Sultan. The design emphasizes stealth features guided by acoustic research performed in cooperation with institutions including Admiralty Research Establishment successors and analytics used by the Defence Science and Technology Laboratory.

Propulsion and nuclear reactor

Propulsion is provided by a pressurised water reactor developed by Rolls-Royce plc drawing on heritage from reactors powering the Astute-class submarine and earlier Royal Navy nuclear submarines, with propulsion machinery integrated by BAE Systems. The reactor and steam turbine plant are designed for long intervals between refuelling, aligning with doctrine established during the Cold War and technical approaches comparable to reactors used by the United States Navy and designs discussed at forums involving the Nuclear Decommissioning Authority and nuclear regulators such as the Office for Nuclear Regulation.

Armament and payload

Armament centers on submarine-launched ballistic missiles (SLBMs) compatible with the Trident II (D5) system and warhead arrangements governed by the Nuclear Non-Proliferation Treaty obligations and national policy statements. The submarine will carry a complement of strategic missiles in vertical launch tubes and has capacity for self-defence weapons derived from Spearfish heavyweight torpedoes and potentially decoy and countermeasure suites interoperable with systems used on contemporary United Kingdom submarines. Weapon safety, handling and storage practices adhere to protocols shaped by the Ministry of Defence and international norms codified in documents reviewed by the House of Commons Defence Committee.

Construction and timeline

Construction has been concentrated at Barrow-in-Furness shipyards operated by BAE Systems Submarines with module manufacture by suppliers including Babcock International and systems integration by Rolls-Royce. Programme milestones—design approval, steel cutting, keel-laying, launch, sea trials, and commissioning—have been scheduled across decades. Delays and timeline revisions have been reported in assessments by the National Audit Office and debated in House of Commons sessions, with first-of-class in-service dates moved in response to technical, workforce and budgetary pressures.

Operational role and doctrine

Operational doctrine positions the Dreadnought-class as the sea-based leg of the United Kingdom's nuclear deterrent, executing continuous at-sea deterrence patrols and contributing to strategic stability among nuclear-armed states such as the United States, France, and Russia. Crewing and operational concepts draw on practices from the Royal Navy Submarine Service and are coordinated with national command arrangements involving the Prime Minister of the United Kingdom and military command structures, consistent with policies articulated during national security reviews and parliamentary oversight.

Controversies and cost issues

The programme has generated controversy over cost growth, schedule slippage, industrial capability, and strategic choices, with critical reporting by the National Audit Office and scrutiny from MPs on the Public Accounts Committee and the House of Commons Defence Committee. Debates have referenced wider political and fiscal contexts involving the Chancellor of the Exchequer and national spending reviews, as well as activism and public debates linked to groups such as Campaign for Nuclear Disarmament and parliamentary motions challenging aspects of nuclear policy. Cost estimates and accruals for the Dreadnought programme have been compared to historical expenditures on programmes like Trident renewal and examined in budgetary reviews and defence procurement analyses.

Category:Submarines of the United Kingdom Category:Ballistic missile submarines