Sir Roderick Rocks is the most adventurous of the Gove sites listed by the Marine Life Network. A long boat ride is needed to reach it, and the reward is a spectacular set of granite rocks with caves and swim-throughs, plus a deep wreck of an intact trawler, with maximum depths of around 40 m.

The granite formations are a contrast to the limestone and coral reefs typical of the Top End. Rounded boulders and rock faces create gullies, overhangs and short swim-throughs that are coated with soft corals, sponges, gorgonians and hard coral, and the caves shelter cod, coral trout, sweetlips and crayfish. Out of the lee, pelagic fish such as trevally, mackerel and barracuda are likely, along with reef sharks and turtles.

The trawler wreck lies deep and is described as intact. Its name and history are not published; like other trawlers on Gove reefs it can be expected to host large gropers and schooling fish. At around 40 m it is a dive for experienced deep divers – within the limits of recreational training only on a short, carefully planned dive, and better suited to divers with decompression training.

The combination of remoteness, depth and granite topography makes Sir Roderick Rocks an expedition-style site rather than a routine dive. There is little published information beyond the Marine Life Network summary, and any trip should be planned with local knowledge. It suits advanced and technical divers who value rarely visited sites and are comfortable far from help. A calm forecast for the whole day is essential, because the return trip is long and the south-east trade wind can rise sharply by early afternoon.

Sir Roderick Rocks requires a long boat ride from Nhulunbuy (launch at the Gove Boat Club ramp, Melville Bay) and should only be attempted in a large, well-equipped boat on a calm day with a local skipper who knows the position. Carry extra fuel, water, oxygen and satellite communications. Anchor in sand beside the rocks or run a live-boat drift pickup.

Nhulunbuy is reached by daily flights from Darwin and Cairns.

The Gove Peninsula sits at the north-west corner of the Gulf of Carpentaria, and tidal ranges here are much smaller than at Darwin (roughly 2–3 m), so diving is less tide-bound – but slack water still matters at channel and point sites. From April to September the south-east trade wind blows hard (often 15–25 knots), making the exposed east-facing coast and offshore islands rough by late morning; early starts and sites in the lee of islands are the norm. The build-up and early wet (October–December) bring glassy calm days and the best visibility.

In the wet season (December–March) the Gulf side is often still diveable, but inshore sites lose visibility after rain, cyclones are possible and box jellyfish are present.

Plan two dives: the granite rocks, exploring caves and swim-throughs at 10–20 m, and a separate deep dive to the trawler wreck (to about 40 m) with strict no-deco or planned-decompression limits. Use nitrox on the rocks and appropriate training and gas for the wreck.

Trawler at ~40 m: nitrox for the rock dive; the wreck needs deep training and ideally decompression qualifications; carry redundant gas. Do not enter caves or wreck without appropriate training.

Gove Diving & Fishing Charters (Nhulunbuy, ph 08 8987 3445) has provided air fills, gear hire, courses and boat trips to the offshore islands; confirm current operation before travelling. Otherwise private boats from the Gove Boat Club ramp, and local residents' informal dive groups.