A very rare Cold War bunker hidden in the Norfolk countryside has gone on the market for just £20,000 – with a very creepy surprise inside.

Dersingham’s Cold War-era Royal Observer Corps (ROC) post was once part of a huge network of observation posts up and down the country.

It was built in 1957 as part of an early warning system to detect impending nuclear attack and calculate its fallout.

The remarkable remnant of history is set to be auctioned for a guide price of £20,000 on May 8 and is located on the edge of the royal Sandringham Estate. 

Pictures of the spooky bunker show a metal ladder going down 15 feet into the ground. 

Inside, there are merely two rooms in total – with the smaller containing the toilet, while the larger room was used for observation and sleeping. 

But next to the rickety beads and threadbare walls, a bizarre naked mannequin can be seen in the photographs of the listing – making for a very strange sight. 

With nothing on, and only having a blonde wig and fake eyelashes, the chipped and dented figure adds an eerie feel to the photos of the historic shelter, having clearly been neglected for many years.  

A very rare Cold War bunker hidden in the Norfolk countryside has gone on the market for just £20,000

Pictures of the spooky bunker show a metal ladder going down 15 feet into the ground

While in use, the shelter would have been kitted out with standardised furniture in the form of canvas chairs, a folding table, shelf, cupboard and a pair of metal-framed bunk beds.

It’s clearly of its time – as on the wall there also hangs an asbestos fire blanket. 

On the shelves, there are old tin cans, while there’s an old fire extinguisher in the corner.  

The Dersingham post was manned by trained uniformed volunteers from the 1950s through to 1991, when the last posts were closed and either demolished or sold off.

Most remaining posts are in a derelict condition, which marks this particular one as a rare find.

Hidden in the middle of the countryside, its listing makes for an unexpected treat.  

But next to the rickety beads and threadbare walls, a bizarre naked mannequin can be seen in the photographs of the listing

With nothing on, and only having a blonde wig and fake eyelashes, the chipped and dented figure adds an eerie feel

The chipped and dented mannequin raises many questions about the eerie shelter

The hangout only has two rooms inside – and one of them featured a very strange sight

Take a look inside a rare Cold War bunker hidden in the countryside which is now on the market

Three vital pieces of equipment would also have been housed here: the Fixed Survey Meter, the Bomb Power Indicator and the Ground Zero Indicator.

The post features two key constructions with a concrete Class A Orlitt hut above ground, and a hidden underground bunker.

Both structures were completed due to the heightened threat of nuclear war.

The Orlitt hut first emerged in key locations around the country to allow the ROC to monitor and assess possible attacks by aircraft.

Each hut was designed to house three observers, with each volunteer tasked with specific duties.

Mark Upston, of East Anglian Auction House, said: ‘This is truly a special opportunity for those who are drawn to properties with historical significance.

‘This post was once a vital part of our defences and will be a treasured asset to a buyer keen on preserving our past.’

It’s clearly of its time – as on the wall there also hangs an asbestos fire blanket

In one room, there was a rickety wire bunk bed and minimal decorations

In the other tiny room, there was only a small toilet

The remarkable remnant of history is set to be auctioned for a guide price of £20,000

On the shelves, there are old tin cans, while there’s an old fire extinguisher in the corner

On the wall, instead of picture frames, is a warning sign to ‘mind your head and back’

In recent months, following growing threats of World War Three, Brits have been scrambling to get their hands on such shelters. 

Hollow shells ready to be dug into a fearful resident’s garden are being flogged on eBay for nearly £10,000.

Royal Observer Posts, designed to protect observers 15ft below the surface, are being snapped up for well over their asking price.

Specialist companies are even offering to build fully-fitted prefabricated structures – saying they have seen a huge increase in inquiries following the outbreak of war in Ukraine.