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 dark parts of the cave where the witch was hiding. The blessed water immediately petrifies the witch, and she remains in the cave to this day. A 1000-year-old skeleton of a woman was discovered in the caves by Balch in 1912, and has also traditionally been linked to the legendary witch. The remains have been part of the collection of the Wells and Mendip Museum, which was 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 down to the legend