Wookey Hole Caves to 1874 by William Boyd Dawkins, who moved to Somerset to study classics with the vicar of Wookey. On hearing of the discovery of bones by local workmen he led excavations in the area of the hyena den. His work led to the discovery of the first evidence for the use by Palaeolithic man in the Caves of the Mendip Hills. Middle Paleolithic tools have been found in association with butchered bones with a radiocarbon age of around 41,000 years. Herbert E. Balch continued the work from 1904 to 1914, when he led excavations of the entrance passage (1904–1915), Witch's
Caves of Meghalaya partially explored, for a total length of caves explored. With an explored length of , Krem Liat Prah in Jaintia Hills is the longest cave in Meghalaya, as well as India, and is listed among the longest caves in the world. Krem Liat Prah contains a huge passage called the "Aircraft Hangar." Since the MAA was established in 1994, the explored caves account for only about 5% of the total underground passages in the state of Meghalaya. Limestone mining for the cement industry is a major threat to the Caves of Meghalaya, causing a major collapse of the Krem Mawmluh