Mendip Hills to the development of cave diving in Britain. The first cave dive was attempted at Swildon's Hole in 1934, and the first successful dive was achieved the following year at Wookey Hole Caves, which has the deepest sump in Britain at 76 m (250 ft). The cave complexes at St. Dunstan's Well Catchment, Lamb Leer, and Priddy Caves have been identified as Sites of Special Scientific Interest. The deepest cave in the Mendip Hills is Charterhouse Cave with a vertical range of . Many caves in the Mendip area were excavated for archaeological and natural history studies by pioneer explorer
Wookey Hole Caves preserved in the name of a stalagmite in the first chamber of the caves. The story has several different versions with the same basic features: A man from Glastonbury is engaged to a girl from Wookey. A witch living in Wookey Hole Caves curses the romance so that it fails. The man, now a monk, seeks revenge on this witch who—having been jilted herself—frequently spoils budding relationships. The monk stalks the witch into the cave and she hides in a dark corner near one of the underground rivers. The monk blesses the water and splashes some of it at the