sentences:  Although the first scientific diving expedition in Australia was carried out by Sir Maurice Yonge to the Great Barrier Reef in 1928, most scientific diving did not start until 1952 when the Commonwealth Scientific and Industrial Research Organisation began work to understand the pearl beds of northern Australia in 1957.Commercial divers worked under Australian Standard CZ18 "Work in Compressed Air" in 1972.This standard applied to caisson workers and divers so the underwater work was drafted into AS 2299 "Underwater Air Breathing Operations" in 1979.