Ex-HMAS Tobruk

Ex-HMAS Tobruk Wreck, Hervey Bay

By ScubaDownUnder Team · 2026-07-01

An hour out from Hervey Bay, well past the shelter of K'gari and over open ocean, the boat slows and ties onto a mooring above what looks like nothing but blue. There is forty kilometres of water in every direction, and somewhere below, lying on its side in the half-light, is one of the largest dive wrecks in the southern hemisphere. The ex-HMAS Tobruk is a 127-metre navy landing ship, scuttled here in 2018 and already wearing a skin of coral, and it is the rare Australian wreck that is genuinely vast: big enough that no single dive takes it all in, and new enough that divers are watching a reef assemble itself in real time.

Tobruk served the Royal Australian Navy for 34 years from 1981, a heavy landing ship built to carry tanks, vehicles and troops onto beaches. After decommissioning in 2015 she was earmarked as a dive wreck for the Fraser Coast, and on 29 June 2018 she was scuttled in the Great Sandy Marine Park, roughly halfway between Hervey Bay and Bundaberg. The sinking did not go entirely to plan. Rather than settling upright, the ship rolled and came to rest on her starboard side in about 28 metres of water, a quirk that gives the dive its distinctive sideways geometry. After a period of preparation and assessment she opened to divers in early 2019 and quickly became Queensland's flagship modern wreck.

Because Tobruk lies on her side, the dive plays with a diver's sense of orientation in a way few wrecks do. What were vertical bulkheads are now floors and ceilings, the deck stands up as a wall, and the superstructure reaches sideways into open water. The shallowest point of the wreck is around 11 metres, comfortably within reach of Open Water divers in good conditions, while the hull and seabed run down to 28 metres for those certified to go deeper. The ship's former role is the gift that keeps giving underwater: built to swallow tanks and armoured vehicles, her internal spaces and passageways are far wider than those of a typical battle-class warship, and wreck-trained divers can move more than 100 metres through the interior on a single line. The flight deck, the vehicle decks, the bridge and the bow ramp are all there to be explored, layered by depth and by experience.

For a wreck this young, the colonisation has been quick. Hard and soft corals, anemones and sponges have taken hold across the hull and railings, and the steel now carries the molluscs and invertebrates that anchor any reef food chain. Schools of baitfish shimmer over the decks and pull in pelagic hunters, while Queensland groper and cod have moved into the larger openings and wobbegong sharks settle on the flat surfaces. Green and loggerhead turtles pass through, eagle rays and stingrays work the sand beside the hull, and the surrounding Great Sandy Marine Park puts the wreck on the path of migrating humpback whales, which move along this coast between June and October. The marine life is still building year on year, which means the wreck a diver sees today is measurably richer than the bare steel of 2019.

The Tobruk is an offshore site and rewards good timing. Water temperature is mild for a wreck of this depth, ranging from around 21°C in winter to 27°C in summer, so a 5mm wetsuit covers most of the year and a 3mm suits the warmest months. Visibility is the variable to watch: partly sheltered by K'gari to the north, the site often offers a clean 10 to 20 metres and can open past 25 on the best days, but plankton and weather can knock it down, and the deeper interior is darker again. The run from port is around an hour, so the trip lives and dies by the surface forecast, and operators pick their days. Current can run across the wreck, strongest around the tide change, which makes a controlled descent and a good surface marker buoy part of the standard kit. The site dives year-round, with the cooler, calmer months often producing the most reliable conditions.

The wide interior is what sets Tobruk apart for serious wreck divers, and the cavernous tank and vehicle decks make for some of the most accessible large-scale penetration diving in the country, always with proper training, redundancy and a guideline. Outside the hull, the developing coral gardens and the macro life tucked into railings and fittings reward photographers, and the sheer scale of the ship means even frequent visitors keep finding corners they have not seen. The sideways orientation, disorienting at first, becomes part of the appeal once a diver learns to read it.

Tobruk is a dive measured in returns rather than in a single visit. The ship is too big and too new to know in one drop, and every season the reef growing over it changes the experience again. There is a particular pleasure in diving a wreck still in the act of becoming one, watching a vessel that once carried the machines of war turn, slowly and completely, into a living thing.

## Site Access and Logistics

The ex-HMAS Tobruk is a boat dive only, lying around 25 nautical miles offshore in the Great Sandy Marine Park, roughly an hour by fast charter from Hervey Bay and a similar run from Burnett Heads near Bundaberg. The site sits on marine park moorings and is dived by licensed operators who carry small groups out and guide the wreck.

The shallow upper structure can be enjoyed by certified Open Water divers in good conditions, but the depth, the offshore location and the side-lying orientation make Advanced Open Water with solid buoyancy and deeper-water experience the practical standard for the full wreck. Any penetration of the interior is overhead-environment diving and demands a recognised wreck qualification, a reel and line, redundant gas and lights, and the discipline to match. Nitrox is widely offered and useful given the bottom times divers want here.

Hervey Bay is the main hub for trips and gear, with operators including [Hervey Bay Dive Centre](https://diveherveybay.com.au/tours/dive-the-tobruk/) running regular charters to the wreck.

## Sources

- Hervey Bay Dive Centre, ex-HMAS Tobruk dive tour: [https://diveherveybay.com.au/tours/dive-the-tobruk/](https://diveherveybay.com.au/tours/dive-the-tobruk/) - Queensland Government, ex-HMAS Tobruk from wreck to reef: [https://www.qld.gov.au/environment/coasts-waterways/marine-parks/ex-hmas-tobruk](https://www.qld.gov.au/environment/coasts-waterways/marine-parks/ex-hmas-tobruk) - Scuba Diver Life, diving the ex-HMAS Tobruk in Queensland: [https://scubadiverlife.com/diving-ex-hmas-tobruk-queensland/](https://scubadiverlife.com/diving-ex-hmas-tobruk-queensland/) - Diveplanit, diving the ex-HMAS Tobruk wreck: [https://www.diveplanit.com/australia/ex-hmas-tobruk-wreck/](https://www.diveplanit.com/australia/ex-hmas-tobruk-wreck/) - PADI, ex-HMAS Tobruk dive site: [https://www.padi.com/dive-site/australia/ex-hmas-tobruk/](https://www.padi.com/dive-site/australia/ex-hmas-tobruk/)