Zodiac Rock is one of the three Groote Eylandt dives singled out by the Marine Life Network, together with Connexion Island and the dolphins at the Alyangula wharf. As its name suggests, it is a rock outcrop – a natural pinnacle or bommie – off the west coast of the island, reached by a short boat run from Alyangula.

No detailed dive description has been published. A rock rising from the sea floor in the Gulf of Carpentaria typically carries a dense cover of hard and soft corals, sponges and gorgonians on its flanks, and acts as a magnet for fish in otherwise flatter surrounds. Expect reef fish such as coral trout, cod, sweetlips, snapper, angelfish, butterflyfish and fusiliers around the rock, with trevally, queenfish and Spanish mackerel hunting over it. Turtles, rays and reef sharks are likely visitors. Because Groote lies far from the big rivers and tides of the western Top End, visibility is typically better than around Darwin and corals grow more prolifically in shallow water.

The rock's exposure makes it more current-prone than the sheltered island reefs, so slack-water timing and a live boat are advisable. It suits Open Water divers with some experience and advanced divers who want a structured pinnacle dive.

As with all diving on Groote Eylandt, the practical challenges are permits from the Anindilyakwa Land Council, limited accommodation, and the absence of a dive shop – visitors must arrange their own gear, air and boat, ideally through residents who know the site.

Groote Eylandt is about 630 km east of Darwin: fly to Groote Eylandt airport (about 1.5 hours from Darwin or 40 minutes from Nhulunbuy). A recreation permit from the Anindilyakwa Land Council is required before visiting, and commercial accommodation is limited – the Aboriginal-owned Dugong Beach Resort is the main option, as the mining company does not provide tourist accommodation. Boats launch at Alyangula on the island's west coast; sites are a short run from town.

Accessing dive gear on the island may be difficult – bring your own and arrange fills in advance.

Groote sits well inside the Gulf of Carpentaria, where tidal ranges are much smaller than at Darwin and there is less river outflow, so visibility and coral life are better in shallow water. From April to September the south-east trade wind blows strongly and the west-coast sites around Alyangula are in its lee, making them diveable on most mornings. The build-up (October–December) brings the calmest seas.

In the wet season (December–March) the monsoon can bring north-westerly winds onto the west coast, cyclones form in the Gulf, and box jellyfish are present; inshore visibility drops after heavy rain.

Anchor in sand beside the rock at slack water, descend and circle it at 12–20 m, then spiral up to shallower coral on the top for the second half of the dive and safety stop. Watch for current on the exposed side.

No commercial dive operator on Groote Eylandt. Diving is done by residents (mostly mining-community members) with private boats; Dugong Beach Resort and Groote Eylandt Sports Fishing run fishing trips and may assist by arrangement. Visitors must bring or arrange their own dive gear and air.