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Kelvedon Hatch Secret Nuclear Bunker

The Kelvedon Hatch Secret Nuclear Bunker at Kelvedon Hatch, in the Borough of Brentwood in the English county of Essex, is a large underground bunker maintained during the Cold War as a potential regional government headquarters. Since being decommissioned in 1992, the bunker has been open to the public as a tourist attraction, with a museum focusing on its Cold War history.

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1. Building and intended purpose
The three-level bunker was first built on compulsory-purchased farmland as an air defence station an R4 Sector Operations Control or SOC as part of the RAF ROTOR air defence project. Upon the demise of the ROTOR SOC the remaining Nuclear Reporting Cell and UKWMO elements were incorporated into a Home Office Regional Seat of Government or RSG.
The bunker was able to hold various numbers in the hundreds of military and civilian personnel, the numbers changing over the years as the role of the building changed from SOC to RSG and in its later years; Regional Government Headquarters or RGHQ. In the event of a nuclear strike the RSG / RGHQs etc. would be tasked to organise the survival of the population and continue government operations.

2. History
The Kelvedon Hatch bunker was built in 1952–53 as part of ROTOR. ROTOR was a programme to improve and harden Britains air defence network. It was constructed by Peter Lind & Company of London who still trade today. The bunker was a hardened three level R4 Sector Operations Centre SOC for RAF Fighter Command. It was to provide command and control of the London Sector of Fighter Command.
During the 1960s, 1970s, 1980s and early into the 1990s, the UK government Home Office maintained the bunker as an emergency regional government defence site. Eventually in the early 1990s when nuclear threat was seen as diminished, the bunker was sold back to the farming family who had owned the land in the 1950s. It is now a Cold War museum and retains many of its original ROTOR and RSG/RGHQ features.

3. Inside the bunker
The bunker is built 125 feet 38 m underground and the entrance is through an ordinary looking bungalow a standard ROTOR Guard House set amongst trees. The inside of the bungalow leads to a 100-yard-long 91 m tunnel entering the R4 at its lowest floor of three. Above are two more floors, the hill which covers it, and a radio mast some distance away.
The bunker was able to accommodate some hundreds of personnel the numbers changing as function and form varied over the years and could sustain them for up to three months. The bunker has air conditioning and heating using the original ROTOR AC-Plant but replacing the original coolant with a more modern type, its own water supply mains water and its own deep bore hole and generators, and was equipped with many types of radio equipment, protected EMP telecommunications, teleprinter MSX networks and various military systems: MOULD system to provide communications between Regular Army, TA Battalions and the Army District and Regional Headquarters and CONRAD radio government communications systems post nuclear strike etc.

4. Modern times
By 1992 the bunker was no longer required, so was decommissioned and the land was sold back to the original owners, the Parrish family. It has now been renovated and made into a museum and tourist attraction; many locals appreciate the irony of the many brown tourist road signs in the area, clearly directing people to the "Secret Nuclear Bunker". The BBC TV show Top Gear featured the signs.
The bunker was used as a "Killers Location" for The Murder Game. Both the living quarters and the operational zone were set up for the "Killers Game" in the finale. It also played a significant role in an episode of New Tricks titled "The Queens Speech", first broadcast on BBC1 on 20 October 2014.
In 2010 the independent British post-apocalyptic/horror film S.N.U.B! was filmed in the bunker.
The 2016 full-motion video game The Bunker, which uses live-action footage, was fully filmed inside the bunker.
In recent years the land surrounding the ex-secret Nuclear Bunker has been used for Obstacle racing events, provided by the Nuclear races company.

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