The Cave Diving Group (CDG) is a United Kingdom-based diver training organisation specialising in cave diving.
The CDG was founded in 1946 by Graham Balcombe, making it the world's oldest continuing diving club. Graham Balcombe and Jack Sheppard pioneered cave diving in the late 1930s, notably at Wookey Hole in Somerset.
Passages through caves are often blocked by a submerged section, or sump. Cavers in many countries have tried to pass these barriers in a variety of ways; using the simple "free dive" with a lungful of air or by utilising the available diving technology of the day.
Read more about Cave Diving Group: Early History of Cave Diving in The UK, Formation of The Cave Diving Group, Accomplishments, Organisation and Purpose
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... 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 ... comprises national officers which oversees the running of the Group and liases 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 ...
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