The South West Rocks Dive Centre is best known for the world class diving at Fish Rock including Fish Rock Cave - Australia's best ocean cave dive which runs right through the island of Fish Rock. Also a major site to dive with the Grey Nurse Shark.
Of all the books I have ever read on Australian dive sites all of them list South West Rocks, more specifically Fish Rock Cave in New South Wales as a premier diving spot with the longest underwater sea cave in the Southern Hemisphere and of course the resident Grey Nurse Sharks.