Caves of the Mendip Hills
…first cave dive attempt in Britain took place at Swildon's Hole in 1934. The first successful cave dive in Britain was achieved the following year at Wookey Hole Caves, where the last sump is currently the deepest in Britain at 90 m (300 ft). The cave complexes at St. Dunstan's Well Catchment, Thrupe Lane Swallet…