Hole and Pwll y Cwm was another major feat. In the north of England, divers have made discoveries such as Boreham Cave, Notts Pot II and the connection between Gaping Gill and Ingleborough Cave and that between Gavel Pot and Pippikin Pot. Keld Head in Kingsdale has been the scene of operations over many years and the dive through from Kingsdale Master Cave represented a world standard. Later the dive was started from King Pot in the same cave system, a different route with a distance of . In Ireland CDG members dived the connection between Noon's Hole and Arch Cave, and between Prod's Pot and Cascades Rising and between Polloughabo and Polbehan. Several expeditions have connected two or more caves together. This tendency to explore water filled caves has been extended abroad to such places as the Bahamas, where there are flooded ocean blue holes. These have been explored by British divers since the early 1980s; several have been connected. CDG members have been active in exploring many sites in Europe and further afield, often using or pioneering the cutting edge of technology. Organisation and purpose The Cave Diving Group operates under a federal structure comprising four regionally based sections located in the major caving districts of Britain: Somerset, Welsh, Derbyshire and Northern, each with its own Secretary, Treasurer and Training Officer. These are governed loosely by a Central Committee which comprises national officers which oversees the running of the Group and liaises with other bodies. The Cave Diving Group has traditionally not actively recruited members – a position adopted early on in its history when the availability of training and equipment was scarce. Likewise, owing to early fatalities in the sport, cave divers in the United Kingdom (unlike other areas of the world) have usually been represented by cavers who wished to dive. It is a condition of qualification as a cave diver within the CDG that the candidate is an experienced caver as well as a skilled cave diver. A candidate for membership applies to one of the regional sections, making themselves and their experience known to members. They must be over 18 years old and in good health, never having suffered from epilepsy. Training is provided on a regional basis with national training camps under a loose mentoring system. Final election to qualification is carried out by the candidate's peers - other diving members of the