Cave Diving Group

Cave Diving Group of Great Britain

Abbreviation	CDG
Formation	1946
Region served	United Kingdom
President	Geoff Yeadon
Key people	Graham Balcombe (founder)
Main organ	Central Committee
Affiliations	British Caving Association
Website	www.cavedivinggroup.org.uk

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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.