North Korea leader Kim Jong Un has sparked alarm after he threatened to resume nuclear testing - could we be on the brink of World War Three? Kim announced he is ceasing the suspension of nuclear and long-range missile tests established during talks with the US. The dictator also said North Korea would be introducing "a new strategic weapon".
Kims arsenal is now estimated to include up to 50 nuclear bombs and various delivery systems, including solid-fuel missiles designed to beat missile-defence systems and developmental ICBMs potentially capable of reaching the US mainland.
The leader gave no clear indication that a resumption of such tests was imminent and appeared to leave the door open for eventual negotiations.
However, if the worst does happen and WW3 does break out - where is the safest place to go?
These are the UKs nuclear bunkers built in the event of a disaster.
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These tunnels - found beneath the Kingsford Country Park north of Kidderminster, Worcestershire - were originally part of a factory for Second World War munitions.
During the cold war, it served as a nuclear bunker and also housed a BBC studio. The site was sold in 1993 and a cannabis farm of 885 plants was found on the site in 2013.
This historic bunker was built in the 1950s and was designed to fit around 400 politicians underground.
It is found deep underground in Corstorphine Hill. According to Forces Network, the bunker served as Sector Operations Centre for co-coordinating RAF fighter jets and protected Scotland from attacks by Russian long-range nuclear bombers until around 1960.
The 240-acre bunker is in an old underground Bath stone quarry known as Spring Quarry, in Corsham, Wiltshire. After the Cold War, it was taken over by the MoD.
The site was put up for sale in October 2005, and proposed plans for it included a data store or the biggest wine cellar in Europe.
DON'T MISS
The RAF operations centre at High Wycombe has a nuclear bunker. According to Civil Defence Today, it cost approximately 83million to build.
From this bunker, the warning message would have been issued to the United Kingdom Warning and Monitoring Organisation (UKWMO) and would be the trigger for today's National attack warning system.
The Anchor telephone exchange in Birmingham is one of three built in the UK before World War II.
The entrance could be found at the back of Telephone House, between Lionel Street and Fleet Street. Another entrance was on Newhall Street.
Workers at the Anchor telephone exchange were not told they were working on a nuclear bunker during construction and could not tell their family about their work.
The building has been closed down now due to asbestos but the Mess Room and Canteen are intact.
This bunker in North Yorkshire, built in April 1959, was manned by Royal Observer Corps (ROC) personnel.
They would monitor the skies and radiation levels and were ready to act to protect the local residents.
Once damaged by vandals, the Castleton bunker has since been restored and is now a museum.
Royal Naval Armaments Depot Coulport, shortened to RNAD Coulport, on Loch Long in Argyll, sorts nuclear warheads for trident.
This bunker in Essex was first built as an air defence station and became a bunker.
Now it is open to the public as a tourist attraction and houses a museum dedicated to the Cold War.
This bunker, in Colgate, York, was built in 1961. It serves as the regional headquarters and control centre for the Royal Observer Corps's No. 20 Group. Now it is an English Heritage Scheduled Monument.
Hiding underneath the ground of this housing estate in Bridgend Wales is a nuclear bunker developed in the 1960s. It was sold in 1996 and entry is denied.
This is a stately home in Evesham, Worcestershire. The Bredon Wing has a 175-foot bunker beneath it.
This site in Cheshire stayed secret for over 60 years.
According to Visit Cheshire, the 35,000 sq ft underground bunker would have been the centre of regional government had nuclear war broken out.
Now the bunker is open to the public and has a Cold War museum.
Found on a former US air base in Cambridge the building was also known as Magic Mountain, and was made with its own decontamination facility along with its own communications and air supply.
While it was closed in 1991, there are plans to redesign it in the event of an attack or natural disaster.
Located underneath High Holborn street, it was built as an air-raid shelter in the 1940s.
Since then, it has been used as a communications centre by the government, the General Post Office and yet is now for sale.
Despite once being home to the deepest licensed bar in the UK as well as a restaurant and games room to wait out a nuclear attack, it is currently not in use.
This bunker - on the Whiteknights Park campus of the University of Reading - dates back to the early days of the cold war.
Designed to protect against nuclear attacks as strong as Hiroshima and Nagasaki, it later became apparent that it would not be fit for containing humans after an attack.
It was taken over the University library and is now a protected building and Grade II listed.
The bunker includes a central map room, control rooms, satellite cabins, offices and communications room, dormitories and a canteen.
It has been described as "remarkably intact."
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World War Three: Safest bunkers to hide in UK if North Korea deploys nuclear weapon - Express