The backdrop would be envied by M. Night Shyamalan as one of the film director's next horror movie locations.
But RAF Bempton remains closed off to the public forever after the entrance to its hidden chambers were sealed with concrete for all eternity.
Abandoned in 1981, the underground site near Bridlington is disguised as an abandoned bungalow on the surface.
But beneath its creepy exterior of a huge chimney stack and bricked-up barricades, it is still a place with an aura of haunting and mysterious memories.
Urban explorers have unearthed the erotic drawings daubed on the walls of the labyrinth of walls and submarine-style hatches.
The murals are part of a collection believed to be the same location where satanic ritual and devil worship took place throughout the late 70s and early 80s.
It was even described in one post as a "subterranean Satan witches' coven" and the sexually-explicit images are still down there.
The site closed down officially as RAF Bempton in 1950 and after a few names changes, including the 146 Signals Unit Bempton, it was disbanded later in December 1961.
It changed into private hands in the early 80s after plans to transform it into a holiday camp were shelved.
The disturbing graffiti has proven popular with a legion of Urban Explorers. One said they had been forced to crawl through a series of cowpats to gain access to the site - before the entrances were concreted over - in 2009.
He posted: "The bunker is situated on only one level, unlike RAF Holmpton, which is close by, there is a large area of fire damage in the large full length room along one side of the hall.
"Some of the graffiti in the bunker is a little fruity and goes back to times when the bunker was used as a location for satanic ritual."
Another explorer called 'Madmax' also visited the site at the same time.
He told the forum: "According to a very reliable source, Bempton was used for devil worship in the 80s. Apparently the police eventually raided the bunker and arrested the dodgy blighters who were holding black masses down there."
The site joins other abandoned RAF bases and related buildings including RAF Predannack, RAF Stenignot and RAF Upwood which were left to rot - despite their pivotal roles during the Second World War.
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