Chislehurst Caves

Chislehurst Caves is an extensive network of man-made tunnels beneath Chislehurst in the London Borough of Bromley, England. Despite the name, the caves are not natural formations but former chalk and flint workings extending for approximately 22 miles beneath an area of around six hectares, with some passages reaching about 30 metres below ground level. Chalk extracted from the workings was used for lime burning and brickmaking, while flint had numerous domestic and industrial uses. The precise age of the oldest workings remains uncertain, and older claims that separate sections were created by Druids, Romans and Saxons are not supported by firm archaeological evidence. The caves opened to the public as an attraction in 1900 and subsequently acquired several very different uses. During the First World War they stored ammunition associated with the Royal Arsenal at Woolwich, while mushroom cultivation took place during the interwar years. During the Second World War the tunnels were transformed into a vast air-raid shelter capable of accommodating around 15,000 people, with electric lighting, water, sleeping areas, a hospital and a chapel. After the war, Chislehurst Caves became an unusual music venue, hosting performers including David Bowie, The Rolling Stones, Jimi Hendrix and Pink Floyd. Their long passages, chalk walls and almost complete isolation from the surface have also made the caves a recurring film and television location.

Chislehurst Caves has appeared in Jazz Boat (1960), Beat Girl (1960), Doctor Who (1963–), Inseminoid (1981), The Tribe (1998), The Riddle (2007), Merlin (2008–2012), Final Prayer (2013), Fungus the Bogeyman (2015), Slaughterhouse Rulez (2018), The Marine 6: Close Quarters (2018) and The Third Day (2020). The tunnels have represented a London dance venue, caves on an alien planet, an underground extraterrestrial base, the hidden home of an unconventional social group, a tramp’s residence, medieval caverns, an underground supernatural entity, the subterranean world of the Bogeymen and tunnels beneath both a private school and an abandoned industrial complex.

In Jazz Boat (1960), Chislehurst Caves appears near the beginning of the film as a real underground dance venue. A group of motorcyclists arrives at the caves while Ted Heath and His Music perform for the crowd inside. Spider Kelly, the Dancer and other members of a criminal gang also use the caves as a convenient place to meet and discuss their plans for a jewellery robbery. Spider obtains a key from his father and takes several of the gang into a quieter part of the tunnel system, where they go over the details of the proposed crime before leaving through another doorway at the rear of the caves. Electrician Bert Harris is also at the event, and a misunderstanding about his identity eventually draws him into the gang’s scheme. The production therefore uses both the public entertainment area and deeper passages within the real caves.

In Beat Girl (1960), Chislehurst Caves is used as one of the underground gathering places frequented by Jennifer and her group of young beatnik friends. Jennifer, played by Gillian Hills, rebels against her architect father and his new French wife while becoming increasingly attracted to the nightlife and attitudes of London’s youth subculture. During one of their nights out, Jennifer and her friends gather inside Chislehurst Caves to dance, making use of the location’s real contemporary role as a music and dance venue. The dark chalk passages, crowded dancers and music create an underground youth environment that contrasts sharply with Jennifer’s conventional family home. The production was filmed in 1959, when Chislehurst Caves was genuinely developing a reputation as an unusual venue for jazz, skiffle and emerging rock music.

In Doctor Who (1963–), Chislehurst Caves appears extensively in the 1972 six-part serial “The Mutants”, starring Jon Pertwee as the Third Doctor and Katy Manning as Jo Grant. The story takes place in the thirtieth century around the planet Solos, where the indigenous population is struggling against human colonial rule while some of its inhabitants undergo frightening physical mutations. Exterior views of Solos were filmed at the former Western Quarry at Bluewater, while a different cave system at Stone House Farm provided the entrance to the underground passages. Once the Doctor, Jo and Ky move deeper underground, however, the interiors become Chislehurst Caves. The characters wander through the tunnels while attempting to understand both the mutations and the true environmental conditions of the planet, and they encounter mutated Solonians within the passages. Filming inside Chislehurst Caves took place from 10 to 12 February 1972.

In Inseminoid (1981), also released as Horror Planet, Chislehurst Caves provides most of the underground archaeological complex on a distant planet and consequently appears throughout a large proportion of the film. A multinational team of scientists and archaeologists is investigating the remains of an ancient alien civilisation when members of the expedition discover a sealed chamber beneath the surface. After researcher Sandy is attacked and impregnated by an alien creature, her behaviour changes dramatically and she begins hunting and killing the other members of the team inside the base. Director Norman J. Warren chose Chislehurst because its extensive network of real tunnels could provide a scale and variety that the production could not afford to construct in a studio. Principal photography began on 12 May 1980, and the production spent approximately three weeks filming inside the caves before moving to Lee International Studios for another week. The tunnels were dressed with doors, equipment, lighting and futuristic details to create the underground headquarters, while exterior views of the alien planet were filmed separately on Gozo in Malta. The cold, damp and confined conditions made the shoot physically difficult for cast and crew, but the real passages became one of the film’s defining visual elements.

In The Tribe (1998), Chislehurst Caves appears when the unconventional group at the centre of Stephen Poliakoff’s television film introduces property developer Jamie to another side of their world. Jamie has initially been sent to remove the group from the large house they are occupying but becomes increasingly fascinated by their communal lifestyle and by their leader, Emily. During what the group calls an open day, they take him beneath the apparently ordinary suburban surroundings and reveal the extensive tunnel system of Chislehurst Caves. The excursion is part of a series of places through which the group encourages Jamie to look beyond conventional appearances and reassess the ordered professional life from which he has come. Rather than disguising the caves as a mine, military complex or fantasy environment, the film uses the real underground network as an unexpected landscape hidden beneath suburban London.

In The Riddle (2007), Chislehurst Caves represents the underground home of the eccentric tramp played by Derek Jacobi. Sports journalist Mike Sullivan becomes involved in a murder investigation connected to the discovery of an unpublished manuscript apparently written by Charles Dickens. Together with police officer Kate Merrill and the mysterious tramp, he attempts to unravel the connection between the manuscript and the modern crimes. The tramp lives inside the cavernous tunnel system, giving Jacobi’s character an unusual refuge removed from the streets above. The caves provide the setting for scenes in which Mike and Kate seek him out and obtain information connected to the mystery. Jacobi also portrays Charles Dickens in historical sequences, strengthening the connection between the tramp and the nineteenth-century story hidden within the manuscript.

In Merlin (2008–2012), Chislehurst Caves appears in the first-season episode “The Mark of Nimueh”. After the sorceress Nimueh contaminates Camelot’s water supply with magic, a deadly illness begins spreading through the city. Merlin and Gaius discover that the disease is connected to an Afanc, a magical water creature created from clay and animated by sorcery. Merlin and Arthur eventually enter the underground passages beneath Camelot to find and destroy the creature. The tunnel and cavern scenes were filmed inside Chislehurst Caves, where Merlin secretly uses his magic during the confrontation while attempting to prevent Arthur from discovering his powers. The real chalk passages provide the subterranean environment leading to the water creature’s lair.

In Final Prayer (2013), originally released in the United Kingdom as The Borderlands, Chislehurst Caves provides the underground tunnels beneath the remote church investigated by Deacon, Gray and Father Mark. The Vatican team has been sent to determine whether apparently supernatural events at the church represent a genuine miracle or an elaborate deception. Their investigation gradually reveals evidence that the site predates Christianity and may have been associated with ancient pagan sacrifices. During the climax, Deacon and Gray descend through an increasingly narrow system of tunnels beneath the church while searching for their missing colleagues. The passages become progressively tighter, warmer and more organic in appearance until the two men realise that they have not simply entered an underground chamber. They have moved into the digestive system of an enormous living entity beneath the church. The walls close around them and begin secreting corrosive fluid as Gray screams that they are being digested alive and Deacon finally begins to pray. Chislehurst Caves supplied much of the genuine underground environment through which the characters descend before the final sections transform into the creature itself, making the real tunnel network an essential part of one of the film’s most memorable sequences.

In Fungus the Bogeyman (2015), Chislehurst Caves represents part of Bogeydom, the filthy subterranean world inhabited by Fungus, his wife Mildew, their son Mould and the other Bogeymen beneath the human world. Based on Raymond Briggs’ book, the three-part Sky adaptation contrasts the damp, dirty underground society of the Bogeys with the clean surface world inhabited by humans, whom the Bogeys call Drycleaners. The natural-looking but entirely man-made passages of Chislehurst provide part of the underground environment through which the Bogeys move. The caves are particularly associated with the third episode as events involving Fungus and his family force the two worlds increasingly into contact. Other sections of Bogeydom and the characters’ homes were created using sets and visual effects, while Chislehurst supplies the physical tunnel environment.

In Slaughterhouse Rulez (2018), Chislehurst Caves represents the network of tunnels beneath the elite Slaughterhouse boarding school. The school has allowed hydraulic fracturing on its land in return for money, but the drilling opens a massive underground sinkhole and disturbs predatory creatures living beneath the property. As the creatures begin attacking students and staff, Donald Wallace, Willoughby Blake, Clemsie Lawrence and the other survivors discover more about the extensive tunnels running beneath the school. Chislehurst Caves is used particularly during the final part of the film as the characters enter the subterranean system and confront the creatures within the confined passages. The chalk tunnels provide the real physical basis of the underground world connecting the sinkhole, the school grounds and the monsters’ lair, while Stowe School in Buckinghamshire supplied much of the above-ground Slaughterhouse campus.

In The Marine 6: Close Quarters (2018), Chislehurst Caves provides part of the underground tunnel system beneath the abandoned industrial complex where former Marines Jake Carter and Luke Trapper become involved in the kidnapping of Sarah Dillon. The pair discover that Sarah is being held by Irish criminal Maddy Hayes and her gang, who are using the girl to pressure her father into influencing the verdict in a criminal trial. As Jake and Luke fight their way through the building and attempt to rescue her, the action eventually moves underground. The tunnels filmed at Chislehurst become the location of one of the film’s major confrontations when the Marines and Sarah are surrounded by Maddy’s men. Jake is shot and seriously wounded and ultimately sacrifices himself, charging the attackers so that Luke can continue pursuing Maddy and rescue Sarah. The cave sequence is therefore directly connected to the death of Jake Carter, the recurring protagonist of the later films in The Marine series.

In The Third Day (2020), Chislehurst Caves represents a hidden cave system on the fictionalised version of Osea Island. The psychological drama follows two visitors who arrive on the isolated tidal island at different times and become caught up in the secretive traditions and violent religious beliefs of its inhabitants. In the fifth episode, “Tuesday – The Daughter”, Kail takes Ellie into the caves and begins revealing aspects of the island’s history and mythology to her. The walls are marked with symbols, and Kail tells Ellie disturbing stories connected to Osea’s founder and the beliefs maintained by the island community. Although much of the series was filmed on and around the real Osea Island in Essex and at several locations across Kent, the underground passages seen during Ellie’s exploration were filmed at Chislehurst Caves.

---