Meet the site
Cray Cave sits on the outer, south-eastern face of Julian Rocks, the most exposed and current-affected quarter of the island, and is accordingly the domain of more experienced divers. The cave itself is a swim-through narrower and tighter than the well-known Cod Hole a short distance away, threading through the rock at around 18 m before the terrain drops further to a sandy bottom near 25 m, and it takes its name from the painted crayfish that shelter in its recesses year-round. From May to October this is one of the more reliable places at Julian Rocks to find grey nurse sharks resting in numbers, hovering just inside the cave mouth or along the adjacent wall where the current eases; because the site is more exposed than the Cod Hole, it often holds sharks even when boat traffic and diver numbers have moved the animals off the more popular site. Close by is Gorgonian Hollow, a large horseshoe-shaped rock formation at around 22 m known for the ghost pipefish that hide among its black coral, and operators frequently combine the two as a single deeper Julian Rocks dive for suitably qualified customers. Wobbegongs, moray eels, bullseyes and turtles round out a typical dive here, alongside occasional bull rays on the sand below. Because Cray Cave sits on the most exposed side of the island, it is also the first site to be cancelled when a south-easterly swell picks up, and even on runnable days there is usually more current and surge here than at the Nursery or Hugo's Trench. Divers should have solid buoyancy control and be comfortable in an overhead swim-through with some current before booking this site, and should not crowd the cave mouth when sharks are present, since sudden disturbance can push them off the site for the rest of the day.
What you might see
Grey nurse sharks, painted crayfish, wobbegongs, moray eels, bullseyes, turtles, ghost pipefish (nearby Gorgonian Hollow), bull rays
Location
A narrower swim-through/overhang on the outer south-eastern side of Julian Rocks in about 18-25 m, one of the deeper and more advanced sites at the rocks, favoured by grey nurse sharks in winter.
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
byronbaydivecentre.com.audiveplanit.comabyss.com.ausundive.com.ausundive.com.auadreno.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.