Ex-HMAS Canberra

Ex-HMAS Canberra Wreck, Ocean Grove

By ScubaDownUnder Team · 2026-08-26

The mooring line drops away into green water, and for the first ten metres there is nothing to see but particles drifting in the gloom. Then a shape resolves below, grey and immense and unmistakably built by people: the mast, the bridge, the long flush deck of a warship lying upright on the floor of Bass Strait. The ex-HMAS Canberra is 138 metres of decommissioned guided missile frigate, deliberately sunk off Ocean Grove to become a reef, and descending onto it is one of the few dives in Australia where the structure itself, rather than the marine life, is what stops you in the water.

Canberra was the first of the Royal Australian Navy's Adelaide-class frigates, built at Todd Pacific Shipyards in Seattle and launched in 1978. She served for nearly three decades before decommissioning in 2005, the first of her class to be retired. Rather than send the ship for scrap, the Victorian Government and Parks Victoria prepared her as the state's first purpose-built dive wreck, stripping hazards, cutting access points and sinking her on 4 October 2009 in 28 metres of water a few kilometres off the Ocean Grove dunes. The site is now a dedicated recreation reserve, marked by mooring and special buoys, closed to fishing and open only to divers and snorkellers. What was a fighting ship is now, by design, an artificial reef and a piece of accessible naval history.

The wreck sits upright and largely intact, and the dive is essentially vertical, organised by depth. The top of the mast reaches to within five metres of the surface at low tide, and the bridge superstructure begins around eight metres down, shallow enough that the upper levels can be worked by newer divers in good conditions. From there the ship falls away in tiers. The bow rests at about 15 metres, the long main deck runs back through the midships, and the stern sits near 20 metres, while the seabed alongside the hull lies at 28 metres. Companionways, hatches, the helicopter deck and the gun mounting are all recognisable, and large cut openings allow trained divers to pass through holds and passageways that were prepared specifically for safe transit. Most divers plan the wreck in layers, exploring the superstructure on early dives and dropping to the deck and seabed as comfort and certification allow.

More than fifteen years on the bottom have turned the grey steel into a living reef. The superstructure and railings are furred with sponges, jewel anemones, soft corals and bryozoans in the reds, oranges and yellows that temperate Victorian reefs do so well, and the colour is at its most intense under a torch. Schools of bullseyes hang in the lee of the bridge, baitfish stream through the open decks, and southern rock lobster back into the recesses and crevices that the ship's geometry creates in abundance. Weedy seadragons and seahorses work the structure and the surrounding reef, a quiet reward for divers who slow down and search. The site sits within reach of Bass Strait's larger animals as well: Australian fur seals visit from the colonies along the coast, and dolphins and migrating whales pass through the area in season. The marine life here is the slow-built temperate kind rather than tropical spectacle, but on a clear day the contrast of soft coral against naval steel is its own reward.

This is Bass Strait, and the conditions are unmistakably southern. Water temperature ranges from around 11°C in winter to 19°C in late summer, which puts most divers in a drysuit or a heavy semi-dry for all but the warmest months. Visibility is variable and plankton-driven, often sitting between five and fifteen metres but opening past twenty on the clearest days, and it is frequently better down on and inside the wreck than in the green surface layer. The site is offshore and exposed, so swell and wind govern access more than anything underwater does, and charters watch the forecast closely. Current can run across the wreck and is strongest around the tide changes, which makes a brisk descent down the mooring line and a controlled return to it the standard plan. Autumn often brings the cleanest water of the year, while winter offers calm, cold, clear days between fronts.

For divers with wreck training, the prepared penetration routes are the heart of the experience. The cut passages lead through the ship's interior spaces, and working them with proper lights, lines and redundancy is a genuinely technical undertaking that rewards repeat visits. Even without going inside, the ship offers more than a single dive can hold: the bridge, the missile launcher mounting, the funnel and the helicopter hangar each repay close attention, and underwater photographers return again and again for the play of light through the superstructure. The deeper stern and seabed reward divers extending their range, but the wreck never demands it, which is part of why it works across so many certification levels.

There is something fitting in a warship ending its service as a reef. The Canberra spent its working life at the sharp edge of the sea and now lies quietly within it, slowly disappearing under sponge and anemone while divers drift through spaces that once rang with engine noise and the ship's pipe. The dive is part history and part biology, and the best moment is often the first, hanging on the mooring line as the grey ghost of the ship resolves out of the Bass Strait green.

## Site Access and Logistics

The ex-HMAS Canberra is a boat dive only, roughly 25 minutes from Queenscliff Harbour on the Bellarine Peninsula. Access is by licensed charter operator or by booking a two-hour slot on one of the Parks Victoria public moorings, and the reserve is closed to all activity except diving and snorkelling. The site is marked by two special mark buoys and two mooring buoys.

Minimum certification is an entry-level Open Water qualification compliant with Australian Standard AS4005.1, which is enough to enjoy the upper superstructure in good conditions. In practice, the depth, the cold and the offshore exposure make Advanced Open Water with cold-water and deeper-dive experience the sensible standard for the deck and seabed, and any penetration of the interior requires formal wreck or technical training, a reel and redundant gas and lights. Drysuit or heavy thermal protection, a delayed surface marker buoy and good buoyancy control are all expected.

Charters and gear hire are available year-round from operators on the Bellarine and Mornington peninsulas, including [The Scuba Doctor](https://www.scubadoctor.com.au/ex-hmas-canberra-wreck-dive.htm).

## Sources

- The Scuba Doctor, ex-HMAS Canberra wreck dive: [https://www.scubadoctor.com.au/ex-hmas-canberra-wreck-dive.htm](https://www.scubadoctor.com.au/ex-hmas-canberra-wreck-dive.htm) - Parks Victoria, ex-HMAS Canberra reserve: [https://www.parks.vic.gov.au/places-to-see/parks/Ex-HMAS-Canberra-Recreation-Reserve/things-to-do/ex-hmas-canberra](https://www.parks.vic.gov.au/places-to-see/parks/Ex-HMAS-Canberra-Recreation-Reserve/things-to-do/ex-hmas-canberra) - Marine Life Society of South Australia, Australian warships scuttled as dive wrecks 1997 to 2011: [https://mlssa.org.au/2024/09/16/the-australian-warships-scuttled-as-dive-wrecks-1997-2011/](https://mlssa.org.au/2024/09/16/the-australian-warships-scuttled-as-dive-wrecks-1997-2011/) - Wikipedia, HMAS Canberra (FFG 02): [en.wikipedia.org/wiki/HMAS_Canberra_(FFG_02)](https://en.wikipedia.org/wiki/HMAS_Canberra_%28FFG_02%29) - Divernet, Victoria wreck diving guide: [https://divernet.com/scuba-diving/general-wrecks/victoria-wreck-diving-australia/](https://divernet.com/scuba-diving/general-wrecks/victoria-wreck-diving-australia/)