Question: What is a cave diving organisation which was formed in September 1973 that administers and supports cave diving activity in other parts of Australia including the Nullarbor Plain and  a town in inland New South Wales, Australia, located at the junction of the Macquarie and Bell Rivers?
Sentence (from "Warrumbungles"): The Warrumbungles are a mountain range in the Orana region of New South Wales, Australia.
Relevant evidence: No