Diving at Wookey resumed in early June 1946 when Balcombe used his homemade respirator and waterproof suit to explore the region between the resurgence and first chamber, as well as the underground course of the river between the third and first chambers. During these dives, the Romano-British remains were found and archaeological work dominated the early dives in the cave. The large ninth chamber was first entered on 24 April 1948 by Balcombe and Don Coase. Using this as an advance dive base, the 10th and then 11th chambers were discovered. The way on, however, was too deep for divers breathing pure oxygen from a closed-circuit rebreather. The cave claimed its first life on 9 April 1949 when Gordon Marriott lost his life returning from the ninth chamber. Another fatality was to occur in 1981 when Keith Potter was drowned on a routine dive further upstream.