Fish Rock Cave is the signature dive of South West Rocks, built around a long tunnel that cuts through Fish Rock and turns a dramatic offshore pinnacle into one of Australia's best-known shark and cave-style dives. Divers usually circle the rock for schooling fish and shark encounters, then pass through the cave itself, where the light changes, the walls close in, and the swim feels more like a natural corridor than a tiny squeeze. The site is best known for grey nurse sharks, large pelagic fish, turtles, rays, and heavy fish life around the rock, with pink gorgonians and invertebrate growth adding color to the walls and overhangs. Although the cave is wide and frequently dived, the boat access, offshore setting, current, and overhead section make Fish Rock Cave a site for confident divers rather than casual beginners.