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 "The End of Time" (2009), including a scene with the Doctor sharing thoughts and visions with the Ood. On 1 August 2006, CNN reported that Barney, a Doberman Pinscher employed as a security dog at Wookey Hole, had destroyed parts of a valuable collection of teddy bears, including one which had belonged to Elvis Presley, which was estimated to be worth £40,000 (US$75,000). The insurance company insuring the exhibition of stuffed animals had insisted on having guard dog protection. In February 2009 Cottle turned the Victorian bowling green next to the caves into a crazy golf course without first obtaining