Faslane and the Clyde Submarine Base (HM Naval Base Clyde)

Establishment, and the operational-basing vs refitting distinction

Faslane Bay, on the eastern shore of the Gare Loch north of the Firth of Clyde and about 25 miles (40 km) west of Glasgow, was sparsely populated until a naval port was built there during the Second World War, initially constructed and manned by the Army as a marshalling yard. HMS Adamant, depot ship of the 3rd Submarine Squadron, anchored in Faslane Bay in 1957, and the site grew steadily as a submarine base thereafter. The Clyde Submarine Base was commissioned in 1967, and on 1 October 1996 it was renamed His Majesty's (then Her Majesty's) Naval Base Clyde. The shore establishment is HMS Neptune.

The reason Faslane was chosen at the height of the Cold War was geographic: the Gare Loch is deep, sheltered and easily navigable, giving rapid and stealthy access through the North Channel to the North Atlantic patrol areas and, via the GIUK gap, the Norwegian Sea. When the Government confirmed the choice in the Commons on 24 April 1963, ministers stated that survey work would begin immediately and the base would "be completed by 1968" — the deadline by which the Polaris submarines had to be at sea.

The distinction from Card #37 (Rosyth) is institutional and precise. Faslane is the operational base — the home port where the submarines are berthed, stored, crewed, provisioned and from which they sail on patrol. Rosyth (Card #37) was the refitting yard, where the Polaris boats underwent major periodic overhauls, and which lost the Trident refit contract to Devonport in 1993 and later held laid-up decommissioned nuclear submarines. This card does not re-narrate that refitting/decommissioning history, which belongs to Card #37. Today, in fact, all deep-maintenance refuelling and the majority of submarine decommissioning work is carried out at Devonport; Faslane's role is operational basing.

The Polaris and Trident deterrent explained

Britain's submarine-based deterrent originated with the Nassau Agreement (December 1962) and the Polaris Sales Agreement (6 April 1963), under which the US supplied the Polaris missile system to be fitted to British-built submarines carrying British-designed warheads. Four Resolution-class SSBNs were built — HMS Resolution, Repulse, Renown and Revenge (a fifth was cancelled) — all permanently based at Faslane, administered by the 10th Submarine Squadron ("the bombers"), alongside the 3rd Submarine Squadron of fleet and patrol submarines ("the fighters").

HMS Resolution sailed from Faslane on Britain's first deterrent patrol on 15 June 1968. From April 1969 the Royal Navy has maintained an unbroken Continuous At Sea Deterrent (CASD) — at least one armed submarine on patrol at all times — now known as Operation Relentless, the longest sustained military operation in British history. Per GlobalSecurity.org's survey of UK nuclear forces, the Resolution force "conducted over 229 consecutive and continuous patrols," HMS Resolution having deployed "with POLARIS A3P on its first operational patrol in June 1968." To ensure the small force could penetrate Soviet anti-ballistic-missile defences around Moscow, Britain developed the Chevaline warhead improvement, which caused controversy when its secrecy and cost became public in 1980.

From the late 1970s the UK decided to replace the ageing Resolution boats with four larger Vanguard-class submarines armed with the US Trident system (Trident I C4, upgraded to the larger Trident II D5). HMS Vanguard conducted the first Trident patrol in December 1994, and Trident had entirely replaced Polaris by December 1996. The four Vanguard boats — HMS Vanguard, Victorious, Vigilant and Vengeance — remain in service today, each capable of carrying up to 16 Trident II D5 missiles. They are now operating well beyond their originally intended ~25-year service lives; HMS Vanguard had originally been due to retire in 2024.

The replacement is the Dreadnought class — four boats (HMS Dreadnought, Valiant, Warspite and King George VI) under construction at BAE Systems, Barrow-in-Furness, with the first expected to enter service in the early 2030s. Per the House of Commons Library briefing on the programme, "the cost of the Dreadnought programme has been estimated at £31 billion, including inflation over the life of the programme," with "a £10 billion contingency … also … set aside" — an authorised envelope of £41 billion (by March 2024, £17.4 billion had been spent and £3.37 billion of contingency drawn). On 17 April 2025 the Defence Minister confirmed to Parliament that the programme "remains on track for the First of Class, HMS Dreadnought, to enter service in the early 2030s," while declining to give precise in-service dates on security grounds. The Dreadnoughts will be based at Faslane, which requires major infrastructure renewal — jetties and docking facilities — to accommodate them, part of the wider Clyde Transformation Programme.

Royal Naval Armaments Depot Coulport

The submarines' nuclear weapons are not stored at Faslane itself but at RNAD Coulport, on the eastern shore of Loch Long, about 2 miles from Faslane by air (roughly 8 miles by road). Coulport was built 1963–1968 as the storage, maintenance and loading facility for Polaris and today handles the Trident system. Its siting reflects safety and operational rules: the armament depot required its own berth at least 4,400 feet (1,300 m) from the main base but within about an hour's sailing time — a requirement Coulport, on the far side of the Rosneath peninsula, satisfied.

Coulport has up to 16 reinforced-concrete bunkers cut into the hillside and two shoreline berths: the older Polaris Jetty and the covered Explosive Handling Jetty (EHJ) used for Trident warheads. The EHJ, floated to Coulport from Hunterston in 1993, is one of the world's largest floating concrete structures. It is the last depot in Britain to retain the "RNAD" designation. The 1980s Trident works programme at Faslane and Coulport, co-ordinated by the Property Services Agency, took 13 years and cost roughly £1.9 billion at 1994 prices — then the second most expensive UK procurement project after the Channel Tunnel. Importantly, unlike Polaris (fully serviced in Scotland), the Trident missiles are drawn from a shared "mingled-asset" pool at the US Navy's facility at Kings Bay, Georgia; the warheads, however, are UK-owned, designed and made by the Atomic Weapons Establishment at Aldermaston/Burghfield and stored and processed at Coulport, moving by escorted road convoy between Aldermaston and Coulport.

The UK's warhead stockpile policy is directly relevant to Coulport. In the March 2021 Integrated Review (Global Britain in a Competitive Age, CP 403), the Government stated: "In 2010 the Government stated an intent to reduce our overall nuclear warhead stockpile ceiling from not more than 225 to not more than 180 by the mid-2020s. However, in recognition of the evolving security environment … this is no longer possible, and the UK will move to an overall nuclear weapon stockpile of no more than 260 warheads." The MoD has stressed that these ceilings "are ceilings, not targets" and no longer publishes operational stockpile figures. These are the warheads handled at Coulport.

Holy Loch and the US Navy connection (a related but separate facility)

A few miles from Faslane, across the Firth of Clyde near Dunoon, lay the US Navy's Polaris base at Holy Loch — a related but institutionally distinct American facility, not part of the British base. Following a US–UK agreement announced on 1 November 1960, the submarine tender USS Proteus arrived on 3 March 1961, opening Fleet Ballistic Missile Refit Site One, home of US Navy Submarine Squadron 14 (SUBRON 14). The floating dry dock USS Los Alamos was towed over in 1961; over roughly 30 years it completed some 2,800 submarine docking operations. Holy Loch supported US Polaris and later Poseidon submarines patrolling within range of the Soviet Union, and it turned Dunoon into a garrison town.

The base's arrival triggered what the maritime historian Brian Lavery has described as "one of the most active and sustained campaigns of protests in modern British history." With the end of the Cold War, closure was announced on 6 February 1991; the last tender, USS Simon Lake, departed in March 1992, ending more than 30 years of a US submarine presence in Scotland and causing a lasting downturn in the local economy. The key distinction for readers: Holy Loch was an American base for US submarines, whereas Faslane is a British base for Royal Navy submarines. They were near neighbours and both drew anti-nuclear protest, but they were separate institutions.

The Faslane Peace Camp and the anti-nuclear protest movement

The Faslane Peace Camp was begun on 12 June 1982 when anti-nuclear campaigners Bobby and Margaret Harrison pitched a tent beside the A814 road by the base. It has been continuously occupied ever since — described by campaigners as the world's longest continuously occupied permanent peace camp — and now comprises caravans and self-built structures with planning permission for 12 caravans, organised on self-governing, non-hierarchical lines. Its population has fluctuated from perhaps 30 residents in the 1980s to a handful in recent years. The camp holds an archive (Faslane Focus, 1986–2002, and related materials) documenting its history.

Faslane has been the focal point of the broader British anti-nuclear movement, which is closely associated with the Campaign for Nuclear Disarmament (CND) and Scottish CND. Notable direct-action campaigns include Trident Ploughshares (founded 1998 by Angie Zelter, a Right Livelihood Award laureate), which pursues non-violent, openly accountable "disarmament" actions, and Faslane 365 (1 October 2006 onward), a campaign to blockade the base using autonomous groups over a full year. Per Trident Ploughshares' own account, "with 131 blockading groups and 1,150 arrests, the year-long protest … demonstrated the unity and determined commitment of nuclear protesters, including Scottish Lawyers, Health Professionals and Grannies for Peace"; the youngest person arrested was 13-year-old Catherine Holmes. A large blockade in 2001 produced 170 arrests; blockades in February 2002 and others saw hundreds of participants. Serving politicians have repeatedly been arrested at the gates: in 2004 four MSPs including Nicola Sturgeon (SNP) were arrested, along with Green and Scottish Socialist MSPs; Scottish Socialist figures Tommy Sheridan, Rosie Kane and Carolyn Leckie were among those jailed or arrested over anti-Faslane protests in the mid-2000s. This card records these events factually; it does not adjudicate the merits of the protesters' cause.

Faslane in the Scottish independence / nuclear-weapons policy debate (evenhanded treatment)

Faslane is central to one of the most contested questions in modern Scottish and UK politics. Because the debate is genuinely disputed, the documented positions are set out here side by side, without endorsement.

The SNP / Scottish Government position. The SNP has been opposed to nuclear weapons for decades. In the 2013 White Paper Scotland's Future, the Scottish Government made "the speediest safe removal of nuclear weapons" from Scotland a priority, seeking removal of Trident "within the first term of the Scottish Parliament following independence" — a timetable then understood as around 2020–21. A draft written constitution published in June 2014 proposed a constitutional ban on nuclear weapons. The SNP's current published position is that "in an independent Scotland, the SNP would seek to negotiate with the rest of the UK for the removal of Trident from Faslane." Historian Sir Tom Devine has described the removal of Trident from the Clyde as "the most explicit symbol" of the new order the SNP proposed. The party also reversed its long-standing anti-NATO stance in 2012, seeking to join NATO as a non-nuclear member. It is worth noting the position has attracted internal and external scrutiny over feasibility and timing, and critics — including former GCHQ director Sir David Omand — have pointed to tensions between NATO membership and Trident removal.

The UK Government / retention position. The UK Government maintains the deterrent at Faslane and has consolidated the entire submarine fleet there. In the 2013 paper Scotland analysis: Defence it argued that relocating the deterrent would be enormously costly and slow: "Any alternative solution would come at huge cost. It would be an enormous exercise to reproduce the facilities elsewhere. It would cost billions of pounds and take many years." Successive UK ministers have framed Faslane as guaranteeing skilled jobs and Scotland's role in national defence; in 2018 the Secretary of State for Scotland said the "UK's entire submarine fleet will be based at Faslane by 2020."

Expert and Parliamentary assessment on feasibility. Independent and Parliamentary analysis has repeatedly concluded that relocating the deterrent — and especially replicating Coulport — would be very difficult. The House of Commons Scottish Affairs Committee, in its 2012–13 report Terminating Trident — Days or Decades?, concluded that "identifying and recreating a suitable base to replace Faslane and Coulport would be highly problematic, very expensive and fraught with political difficulties," while also finding that the weapons themselves could be disarmed within days and removed within months — the report deliberately contrasting rapid deactivation with slow, costly relocation of permanent facilities. The Commons Defence Committee (HC 198, 2013–14) similarly judged that replicating the facilities "at another site in the UK would take several years and many billions of pounds to deliver." Sites shortlisted in 1963 (Devonport, Falmouth, Milford Haven, Portland, Barrow) all present serious obstacles today: Devonport and Falmouth are close to large populations, raising warhead-handling safety objections; Milford Haven would require closing major oil/LNG facilities; Barrow's estuary is too shallow. Anti-nuclear analysts (e.g. John Ainslie for Scottish CND, in Trident: Nowhere to Go) argue relocation is effectively impossible and that this strengthens the case that independence would force disarmament; defence commentators note that this same difficulty is why the UK Government regards retention at Faslane as essential. Professor Malcolm Chalmers, who studied the original decision, told the Scottish Affairs Committee that "relocation of these bases would be very difficult, if not impossible, to implement," and that it would be "perhaps politically impossible to find a suitable alternative location for the warhead storage facility currently based in Coulport."

Economic significance. Faslane is among the largest single-site employers in Scotland. According to an EKOS report commissioned by Scottish Enterprise Dunbartonshire (reported by UK Defence Journal), Faslane is "the second-largest single-site employer in Scotland" — after Glasgow's Queen Elizabeth University Hospital — with "6,500 military and civilian personnel on-site, with a further 4,000 jobs" via the supply chain (around 11,000 in total), a figure planned to rise to 8,200 once all 11 Royal Navy submarines were consolidated there from 2020. Precise figures are themselves contested in political debate: parliamentary answers obtained by SNP MP Deidre Brock indicated over 6,000 people directly employed at Faslane and Coulport, while the number of civilian jobs tied strictly to the Trident missile system was given by the MoD as 520 — the MoD stating that "there are 520 civilian jobs at Her Majesty's Naval Base (HMNB) Clyde, including Coulport and Faslane, that directly rely upon the Trident programme." This is a reminder that "jobs at the base" and "jobs dependent on Trident specifically" are different measures. Both supporters and opponents of the base cite employment figures in support of their positions.

• The first British nuclear deterrent patrol sailed from Faslane on 15 June 1968, and since April 1969 at least one armed submarine has been on patrol every single day — Operation Relentless, the longest continuous military operation in British history.
• Faslane's Explosive Handling Jetty at Coulport is one of the world's largest floating concrete structures. It was built at Hunterston in Ayrshire and floated to Loch Long in 1993.
• The Trident works programme of the 1980s was, at roughly £1.9 billion (1994 prices), the second most expensive UK procurement project of its era after the Channel Tunnel.
• The Trident missiles are not exclusively British. They are drawn from a shared "mingled-asset" pool with the US Navy at Kings Bay, Georgia; only the warheads are UK-owned and stored at Coulport.
• The Faslane Peace Camp has been continuously occupied since 1982 and is often described as the world's longest continuously occupied peace camp.
• The US Navy ran a completely separate nuclear-submarine base a few miles away at Holy Loch from 1961 to 1992 — its arrival in 1961 sparked mass "Glasgow Eskimos" kayak protests.
• Serving parliamentarians have been arrested at Faslane's gates, including future First Minister Nicola Sturgeon in 2004, during anti-nuclear blockades.
• Faslane became the Royal Navy's single submarine base in 2020, concentrating all UK submarines — deterrent and hunter-killer — on the Clyde.

• Distinct focus from Card #37. This card is deliberately about Faslane's operational basing role. It does not re-narrate Rosyth's refitting of the Polaris submarines, the 1993 loss of the Trident refit contract to Devonport, or the laid-up decommissioned submarines — all of which are covered on Card #37. Readers seeking that content should consult Card #37.
• Faslane vs Holy Loch. These were two separate bases: Faslane is British (Royal Navy); Holy Loch (1961–1992) was American (US Navy). They should not be conflated, though both were on the Clyde and both drew protest.
• "British" Trident missiles. A common misconception is that the Trident missiles are wholly British. In fact the missiles are drawn from a shared US pool at Kings Bay, Georgia; the warheads are UK-owned and handled at Coulport.
• Founding date of the base. Sources variously date the base to its 1940s wartime origins, its 1967 commissioning, or its 1996 renaming as HMNB Clyde. These describe different milestones, not a contradiction: wartime port (1940s) → Polaris base decision (1963) → commissioned (1967) → renamed HM Naval Base Clyde (1996).
• Politically contested content — explicit acknowledgment. The independence/nuclear-weapons policy debate is genuinely contested. Claims about relocation costs and timelines, employment figures, and the feasibility of removing Trident are made by interested parties and should be read as positions, not settled facts. Consistent with the site's "accuracy over patriotism" standard and its practice on other politically contested topics (compare Card #23's treatment of the Royal Regiment of Scotland controversy), this card sets out the documented positions and the range of expert assessment evenhandedly and does not endorse any side.
• "Longest continuously occupied peace camp." This claim is widely made by the camp and its supporters and is well attested, but it is a superlative asserted by interested parties rather than an independently adjudicated record.