Caves of the Mendip Hills then rising up a fracture in the rock. Few caves on the Mendip Hills are more than deep or a few kilometres in length, (with some notable exceptions, such as Swildon's Hole which is over long), but a number are complex with several levels of passages which have been abandoned by the water, for example those around Cheddar. The catchment area of the Cheddar Yeo, which rises in Gough's Cave, measures . Dye marking shows that some of the water travels underground for up to , taking up to 14 days to reach Cheddar. When Banwell Bone Cave was discovered
Wookey Hole Caves in 1989. A collection of fairground art of Wookey Hole was sold in 1997 at Christie's. The present owner is the former circus proprietor Gerry Cottle, who has introduced a circus school. The cave was used for the filming of episodes of the BBC TV series "Doctor Who": the serial "Revenge of the Cybermen" (1975) starring Tom Baker. This has since been referenced in the comedy of "The League of Gentlemen". The cave was also used in the filming of the British series "Blake's 7" (1978) and "Robin of Sherwood" (1983). The caves were used again for "Doctor Who" in