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. More information...
According to PR-model, cavedivinggroup.org.uk is ranked 333,163rd in multilingual Wikipedia, in particular this website is ranked 174,077th in English Wikipedia.
The website is placed before ukrnationalism.org.ua and after thetfordandbrandontimes.co.uk in the BestRef global ranking of the most important sources of Wikipedia.
