Meet the site
The Fish Bommies sit at the deep, seaward end of the gutter that leads up to Fish Rock Cave's deep entrance, on the south-eastern corner of the island at 28 to 32 metres. Rather than a single bommie, the site is a scatter of semi-trailer-sized boulders that have tumbled off the rock over geological time, creating a maze of overhangs, crevices and swim-throughs on the sand. It is one of the better spots at Fish Rock for close encounters with juvenile grey nurse sharks as well as full-grown adults up to three metres, which use the boulder gaps as much as the open gutters, and the structure also holds a strong population of ornate and spotted wobbegongs tucked under the ledges. Black coral trees grow from several of the larger boulders, and sponges and gorgonians cover the exposed faces, giving the site good colour for a spot this deep. Fish and invertebrate life is dense: bullseyes and kingfish move through the gaps, loggerhead and green turtles use the boulders for rest stops, and moray eels, octopus and nudibranchs occupy the smaller cracks. Because the site sits deeper than the cave and Shark Gutters, it is usually offered as a second dive for groups who want a change of scenery and a chance at grey nurse sharks away from the busier gutter mooring, and it works well linked with a swim up to the deep cave entrance to finish. The depth and the maze-like boulder terrain mean it suits divers who are comfortable navigating without a fixed reef line and who can manage a 28-32 m profile with a sensible reserve, rather than newly certified divers, but it rewards that experience with one of the more overlooked but genuinely excellent corners of the Fish Rock complex.
What you might see
Grey nurse sharks (juveniles and adults), ornate and spotted wobbegongs, black coral trees, loggerhead and green turtles, moray eels, kingfish, large cod, cuttlefish, octopus, lionfish
Location
Large boulder formations at the bottom of the gutter leading to the cave's deep entrance, on the south-eastern corner of Fish Rock.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
fishrock.com.auswrdive.com.auRecord updated 27 Sept 2026. Source claims are being reviewed.