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Series of limestone caverns in Somerset county, England

Wookey Hole Caves ('/w//ʊ//k//i/) are a series of limestone caverns, a show cave and tourist attraction in the village of Wookey Hole on the southern edge of the Mendip Hills near Wells in Somerset, England. The River Axe flows through the cave. The low, constant temperature of the caves means that they can be used for maturing Cheddar cheese. The caves were the site of the first cave dives in Britain, undertaken by Jack Sheppard, Graham Balcombe and Penelope Powell in the 1930s. Since then, divers have explored the extensive network of chambers developing breathing apparatus and novel techniques in the process. The full extent of the cave system is still unknown with approximately , including 25 chambers, having been explored. Part of the cave system opened as a show cave in 1927 following exploratory work by Herbert E. Balch. As a tourist attraction it has been owned by Madame Tussauds and, most recently, the circus owner Gerry Cottle. The cave is notable for the Witch of Wookey Hole, a roughly human shaped stalagmite that legend says is a witch turned to stone by a monk from Glastonbury. It has also been used as a location for film and television productions, including the Doctor Who serial Revenge of the Cybermen.

The show cave consists of a dry gallery connecting three large chambers, the first of which contains the Witch of Wookey formation. There are various high level passages leading off from these chambers, with two small exits above the tourist entrance. The River Axe is formed by the water entering the cave systems and flows through the third and first chambers, from which it flows to the resurgence, through two sumps long, where it leaves the cave and enters the open air. The river is maintained at an artificially high level and falls a couple of metres when a sluice is lowered to allow access to the fourth and fifth chambers, two small air spaces. Normally, however, these are only accessible by cave diving. Beyond the fifth chamber a roomy submerged route may be followed for a further , passing under three large rifts with air spaces, to surface in the ninth chamber – a roomy chamber over long and the same high. High level passages here lead to a former resurgence, now blocked, some above the current resurgence. An artificial tunnel leading off from the third chamber allows show cave visitors to cross the seventh and eighth chambers on bridges, and skirt around the ninth chamber on a walkway, before exiting near the resurgence. A second excavated tunnel from the ninth chamber allows visitors to visit the 20th chamber. From the ninth chamber, a dive of about passes almost immediately from the Dolomitic Conglomerate into the limestone, and descends steadily for to a depth of under a couple of high rifts with airbells (enclosed air spaces between water and roof) before reaching air space in the 19th chamber. The 20th chamber is at the top of a large boulder slope – long, wide, and high. From here a roomy passage some long ascends towards a now blocked fossil resurgence in the Ebbor Gorge. The total length of passages in this area is about A passage near the end connects with Chamber 24 near Sting Corner. The continuation is found in the 19th chamber, where of passage descending to a depth of surfaces in the 22nd chamber – of dry passages at various levels with a static pool. The way on is within this pool at a depth of where of passage ascends to surface in the 23rd chamber – of large passage, followed by four short sumps that arrive in the 24th chamber. This is of what is described in the guidebook as "magnificent" river passage, high and wide, which finishes at a cascade falling from a long lake. There are also more than of high level passages above the river. The way on continues underwater for some reaching a depth of before surfacing in the 25th chamber – called the Lake of Gloom because of its thick mud deposits. The sump at the end of this has been dived for to a maximum depth of before gravel chokes prevented further progress. The end is about northeast of the entrance. It then passes through major cave systems such as Swildon's Hole, Eastwater Cavern and St Cuthbert's Swallet, around Priddy, but 95% is autogenic water that has percolated directly into the limestone. The southern slopes of the Mendip Hills largely follow the flanks of an anticline, a fold in the rock that is convex upwards and has its oldest beds at its core. On the Mendips the crest of the anticline is truncated by erosion, forming a plateau. The rock strata here dip 10–15 degrees to the southwest. The outer slopes are mainly of Carboniferous Limestone, with Devonian age Old Red Sandstone exposed as an inlier at the centre. Wookey Hole is a solutional cave, mainly formed in the limestone by chemical weathering whereby naturally acidic groundwater dissolves the carbonate rocks, but it is unique in that the first part of the cave is formed in Triassic Dolomitic Conglomerate, a well cemented fossil limestone scree representing the infill of a Triassic valley. The cave was formed under phreatic conditions i. e. below the local water table, but lowering base levels to which the subterranean drainage was flowing resulted in some passages being abandoned by the river, and there is evidence of a number of abandoned resurgences. In particular, the passages in the 20th chamber are interpreted as a former Vauclusian spring, the waters of which once surfaced in the Ebbor Gorge. It is uncertain whether that was the original rising or whether it formed when the main rising at Wookey was blocked. The current resurgence is located close to the base of the Dolomitic Conglomerate at the head of a short gorge formed by headward erosion with subsequent cavern collapse. The morphology of the passages is determined by the rock strata in which they are formed. The streamway in the outer part of the cave system that is formed within the Dolomitic Conglomerate is characterised by shallow loops linking low bedding chambers, or tall narrow passages, known as 'rifts', developed by phreatic solutional enlargement of fractured rifts. The streamway in the inner part of the system formed within the limestone is characterised by deep phreatic loops reaching depths as much as , with the water flowing down dip along bedding planes and rising up enlarged joints. In the far reaches of the cave the passages descend to below sea level.

Witcombe suggests that the name Wookey is derived from the Celtic (Welsh) for 'cave', ogo or ogof, which gave the early names for this cave of "Ochie" or "Ochy". Hole is Anglo Saxon for cave, which is itself of Latin/Norman derivation. Therefore, the name Wookey Hole Cave basically means cave cave cave. Eilert Ekwall gives an alternative derivation of Wookey from the Old English wocig, meaning a noose or snare for animals. By the 18th century the caves were commonly known as "Okey Hole". It was known as such when it was first described in print in 1681 by the geologist John Beaumont. Fossils of a range of animals have been found including the Pleistocene lion (Felis leo spelæ), cave hyena (Crocuta crocuta spelaea) and badger (Meles meles). Wookey Hole was occupied by humans in the Iron Age, possibly around 250–300 BC, while nearby Hyena Cave was occupied by Stone Age hunters. Badger Hole and Rhinoceros Hole are two dry caves on the slopes above the Wookey ravine near the Wookey Hole resurgence and contain in situ cave sediments laid down during the Ice Age. Just outside the cave the foundations of a 1st century hut have been identified. These had been built on during the Roman era up to the end of the 4th century. In 1544 products of Roman lead working in the area were discovered. The lead mines across the Mendips have produced contamination of the water emerging from the caverns at Wookey Hole. The lead in the water is believed to have affected the quality of the paper produced. The designation of the water catchment area for Wookey Hole, covering a large area of the Mendip Hills as far away as Priddy Pools, as a Site of Special Scientific Interest (SSSI) during the 1970s and 1980s was controversial because of conflicts of interest between land owners, recreational cavers and cave scientists. Initial proposals put forward by the Council of Southern Caving Clubs (part of the British Caving Association) were that SSSI designation, which would restrict what farmers and other landowners were allowed to do, would cover the entire catchment area. This was opposed as being too restrictive and difficult to enforce. It was argued that agricultural use of fields not directly in contact with cave entrances would have little detrimental effect on the caves themselves. There was also debate about which caves and cave features should be considered "important". The final settlement resulted in a smaller area being designated and many agricultural practices being removed from the list of proscribed "Potentially Damaging Operations". The entrance weir and sluice gate servicing the paper mill was built about 1852. The tunnel excavated from the third chamber to the ninth chamber and then out to daylight was dug in 1974–1975 by ex coal miners from the Radstock area.

Archaeological investigations were undertaken from 1859 to 1874 by William Boyd Dawkins, who moved to Somerset to study classics with the vicar of Wookey. On hearing of the discovery of bones by local workmen, he led excavations in the area of the hyena den. His work led to the discovery of the first evidence for the use by Paleolithic humans in the caves of the Mendip Hills. Middle Paleolithic tools have been found in association with butchered bones with a radiocarbon age of around 41,000 years. Herbert E. Balch continued the work from 1904 to 1914, when he led excavations of the entrance passage (1904–1915), Witch's Kitchen (the first chamber) and Hell's Ladder (1926–1927) and the Badger Hole (1938–1954), where Roman coins from the 3rd century were discovered along with Aurignacian flint implements. Rhinoceros Hole was scheduled as an ancient monument in 1992. The 1911 work found of stratification, mostly dating from the Iron Age and sealed into place by Romano British artefacts. Finds included a silver coin of Marcia (124 BC), pottery, weapons and tools, bronze ornaments, and Roman coins from Vespasian to Valentinian II (1st to 4th centuries). The work was continued, first by E. J. Mason from 1946 to 1949, and then by G. R. Morgan in 1972. Later work led by Edgar Kingsley Tratman explored the human occupation of Rhinoceros Hole, and showed that the fourth chamber of the great cave was a Romano British cemetery. During excavations in 1954–1957 at Hole Ground, just outside the entrance to the cave, the foundations of a 1st century hut and Iron Age pottery were seen. These were covered by the foundations of Roman buildings, dating from the 1st to the late 4th century.

The cave as far as the third chamber and side galleries has been known since at least the Iron Age period. Before the construction of a dam at the resurgence to feed water to the paper mill downstream, two more chambers (the Fourth and Fifth) were accessible. Further upstream the way lies underwater. Diving was first tried by the Cave Diving Group under the leadership of Graham Balcombe in 1935. With equipment on loan from Siebe Gorman, he and Penelope ("Mossy") Powell penetrated 170 feet (52 m) into the cave, reaching the seventh chamber, using standard diving dress. The events marked the first successful cave dives in Britain. Diving at Wookey resumed in early June 1946 when Balcombe used his homemade respirator and waterproof suit to explore the region between the resurgence and first chamber, as well as the underground course of the river between the third and first chambers. During these dives, the Romano British remains were found and archaeological work dominated the early dives in the cave. The large ninth chamber was first entered on 24 April 1948 by Balcombe and Don Coase. Using this as an advance dive base, the 10th and then 11th chambers were discovered. The way on, however, was too deep for divers breathing pure oxygen from a closed circuit rebreather. The cave claimed its first life on 9 April 1949 when Gordon Marriott lost his life returning from the ninth chamber. Another fatality occurred in 1981 when Keith Potter was drowned on a routine dive further upstream. Further progress required apparatus that could overcome the depth limitation of breathing pure oxygen. In 1955, using an aqualung and swimming with fins, Bob Davies reached the bottom of the 11th chamber at depth in clear water and discovered the 12th and 13th chambers. He got separated from his guideline and the other two divers in the 11th chamber, ending up spending three hours trapped in the 13th chamber, and had much trouble getting back to safety. Opinion hardened against the use of the short duration aqualung in favour of longer duration closed circuit equipment. Likewise, the traditional approach of walking along the bottom was preferred over swimming. Employing semi closed circuit nitrogen oxygen rebreathers, between 1957 and 1960 John Buxton and Oliver Wells went on to reach the elbow of the sump upstream from the ninth chamber at a depth of This was at a point known as "The Slot", the way on being too deep for the gas mixture they were breathing. A six year hiatus ensued while open circuit air diving became established, along with free swimming and the use of neoprene wetsuits. The new generation of cave diver was now more mobile above and under water and able to dive deeper. Using this approach, Dave Savage was able to reach air surface in the 18th chamber (chambers did not have to have air spaces to be so named; they were the limits of each exploration) in May 1966. A brief lull in exploration occurred while the mess of guidelines laid from the ninth chamber was sorted out before John Parker progressed first to the large, dry, inlet passage of the 20th chamber, and thence followed the River Axe upstream on a dive covering at a maximum depth of to the 22nd chamber where the way on appeared to be lost. Meanwhile, climbing operations in the ninth chamber found an abandoned outlet passage that terminated very close to the surface, as well as a dry overland route downstream through the higher levels of the eighth, seventh and sixth chambers as far as the fifth chamber. These discoveries were used to enable the show cave to be extended into the ninth chamber and the cave divers to start directly from here, bypassing the dive from the third chamber onwards. The way on from the 22nd chamber was at last found by Colin Edmond and Martyn Farr in February 1976 and was explored until the line ran out. A few days later Geoff Yeadon and Oliver Statham somewhat controversially reached the 23rd chamber after laying just a further of line. After a further three short dives they surfaced in the 24th chamber to be confronted by what Statham described as "a magnificent sight—the whole of the River Axe pouring down a passage 40 feet (12 m) high by 5 feet (2 m) wide" terminating in a blue lake after This lake was dived by Farr a few days later for at a maximum depth of to emerge in the 25th chamber, a desolate, muddy place named "The Lake of Gloom". The 25th chamber represents the furthest upstream air surface in Wookey Hole Cave. From here the River Axe rises up from a deep sump where progressive depth records for cave diving in the British Isles have been set: firstly by Farr in 1977, then Rob Parker in 1985, and finally by John Volanthen and Rick Stanton in 2004. The pair returned again in 2005 to explore the sump to a depth of , setting a new British Isles depth record for cave diving. This record was broken in 2008 by Polish explorer Artur Kozłowski, then later again by Michal Marek, on dives in Pollatoomary in Ireland. Taking advantage of the tunnel driven through to Chamber 20 by the show cave management in 2015, a team began seriously to investigate the leads in that area. One small passage was pushed to a sump that was dived through to Sting Corner in Chamber 24. In 2020 a dry connection was made to the same location. A 1000 year old skeleton was discovered in the caves by Balch in 1912, and has also traditionally been linked to the legendary witch, although analysis indicated that they are the remains of a male aged between 25 and 35. The remains have been part of the collection of the Wells and Mendip Museum, founded by Balch, since they were excavated, though in 2004 the owner of the caves said that he wanted them to be returned to Wookey Hole. It was partly the legend of the witch that prompted TV's Most Haunted team to visit Wookey Hole Caves and Mill to explore the location in depth, searching for evidence of paranormal activity. The show, which aired on 10 March 2009, was the last episode transmitted in series 11 of the show's run on the satellite and cable TV channel Living. In 2009, a new actress to play the 'witch' was chosen by Wookey Hole Ltd amid much media interest. Carole Bohanan in the role of Carla Calamity was selected from over 3,000 applicants.