Ex-HMAS Hobart

Ex-HMAS Hobart Wreck, Yankalilla Bay

By ScubaDownUnder Team · 2026-06-20

Four nautical miles off the Fleurieu Peninsula, in the green water of Yankalilla Bay, a guided missile destroyer stands upright on the sand. The ex-HMAS Hobart is 133 metres of warship, sunk on purpose in 2002 and left almost wholly intact, and it is the most complete dive wreck in Australia. Where many scuttled ships are stripped shells, the Hobart still wears its gun turrets, its missile launcher and both funnels, and a diver moving along the deck has the constant, slightly uncanny sense of swimming through a real ship rather than a cleaned-out hulk. It is South Australia's flagship dive, and for wreck divers it is close to a pilgrimage.

Hobart was a Charles F. Adams-class guided missile destroyer, built at the Defoe Shipbuilding yard in Michigan and commissioned into the Royal Australian Navy in the 1960s. She earned the nickname Green Ghost across three tours of duty off Vietnam, a reputation for running quiet and dark. After decommissioning she was chosen as South Australia's first major dive wreck, and on 5 November 2002 she was scuttled in Yankalilla Bay, sinking in under three minutes and settling upright on the bottom exactly as planned. The wreck now lies in the Rapid Head Sanctuary Zone of the Encounter Marine Park, protected under both the Historic Shipwrecks Act and the Marine Parks Act, which means no fishing, a permit to dive and a code of conduct that every visitor is expected to follow.

The Hobart sits upright in 30 metres of water, with the top of the mast reaching to within about five metres of the surface. The dive is layered by depth, beginning on the superstructure and working down across the decks toward the seabed. Because the ship was left so complete, the recognisable features come thick and fast: the forward gun turret, the missile launcher, the bridge, the funnels and the open well of the helicopter deck. Tens of thousands of square metres of the ship are accessible, and prepared openings lead trained divers into the engine room and the internal compartments. For divers staying outside, a single circuit of the hull and superstructure is a full and satisfying dive in its own right, and the upright orientation makes the ship easy to read in a way that side-lying wrecks never are.

More than two decades on the bottom have wrapped the grey steel in life. The hull, railings and superstructure are coated in colourful sponges and encrusting algae, the temperate palette of deep reds, oranges and golds that South Australian reefs produce so well, and the structure now functions as a complete artificial reef. Schools of bullseyes and old wives hang in the lee of the bridge and funnels, sweep and magpie perch drift over the decks, and leatherjackets pick along the growth. In the shadowed recesses and doorways, the southern blue devil and other temperate fish hold their ground, and nudibranchs reward divers working a torch slowly across the plating. The sanctuary zone protection has let this community build undisturbed, and the wreck a diver explores today is a far richer thing than the bare hull of 2002.

This is exposed South Australian water, and it asks for respect. Temperatures range from around 14°C in winter to 21°C in late summer, firmly in semi-dry or drysuit territory for most of the year. Visibility is variable and sometimes limited, often sitting between five and fifteen metres and opening toward twenty on the clearest days. The defining challenge, though, is current. The site can run hard on the tide, and experienced local divers plan their trips around the dodge tide, the period of slack water when the flow eases enough to dive the wreck safely. Outside that window the current can be genuinely dangerous, and operators schedule their charters accordingly. Surface conditions in the open bay add another variable, so the best dives line up calm weather with slack water, which is why booking with a local operator who reads the tide is not optional here.

For wreck-trained divers, the interior is the prize. The engine room, the internal passageways and the machinery spaces are open to those with the right qualification and equipment, and the Hobart's completeness makes the penetration experience unusually rich. Outside, the gun turrets and missile launcher are favourite photographic subjects, and the funnels and mast make natural waypoints for navigation. Repeat divers tend to pick a section per dive, the bow one day and the stern the next, because the ship simply holds more than a single bottom time at 30 metres allows.

The Green Ghost has found a quieter posting. A destroyer that once ran dark off a wartime coast now stands upright in a marine sanctuary, gathering sponge and fish and the slow attention of divers who come from across the country to see it. The Hobart rewards preparation and punishes complacency, and that balance, the real depth, the real current, the real ship, is exactly what makes it the dive South Australian wreck divers measure the others against.

## Site Access and Logistics

The ex-HMAS Hobart is a boat dive only, lying about 4 nautical miles off Marina St Vincent at Wirrina Cove on the Fleurieu Peninsula, around an hour and a half south of Adelaide by road. Diving the wreck requires a permit and, in practice, a booking with a licensed operator, several of whom run charters and keep boats at Wirrina Cove. The site sits on moorings within the sanctuary zone, and a published code of conduct governs how vessels and divers behave on it.

Given the 30-metre depth, the cold and the current, Advanced Open Water with genuine deeper-water and cold-water experience is the working minimum, and operators commonly ask for a dive logged within the past few months. Any penetration of the interior requires a recognised Wreck Diver qualification along with reels, lines, redundant gas and lights. Drysuit or heavy thermal protection, good buoyancy and a delayed surface marker buoy are standard, and Nitrox is worth having for the bottom time.

Charters, gear and briefings are available from Fleurieu operators including [Adelaide Scuba](https://adelaidescuba.com.au/ex-hmas-hobart/), who depart from Wirrina Cove.

## Sources

- Adelaide Scuba, diving the ex-HMAS Hobart: [https://adelaidescuba.com.au/ex-hmas-hobart/](https://adelaidescuba.com.au/ex-hmas-hobart/) - South Australia Marine Parks, diving the HMAS Hobart: [https://www.marineparks.sa.gov.au/enjoy/diving/diving-the-hmas-hobart](https://www.marineparks.sa.gov.au/enjoy/diving/diving-the-hmas-hobart) - SA Department for Environment and Water, ex-HMAS Hobart protected zone: [https://www.environment.sa.gov.au/topics/heritage/maritime-heritage/managing-maritime-heritage/protected-zones/ex-hmas-hobart](https://www.environment.sa.gov.au/topics/heritage/maritime-heritage/managing-maritime-heritage/protected-zones/ex-hmas-hobart) - Scuba Diver Magazine, diving the HMAS Hobart: [https://www.scubadivermag.com/diving-the-hmas-hobart-explore-a-world-class-wreck/](https://www.scubadivermag.com/diving-the-hmas-hobart-explore-a-world-class-wreck/) - Wikipedia, HMAS Hobart (D 39): [en.wikipedia.org/wiki/HMAS_Hobart_(D_39)](https://en.wikipedia.org/wiki/HMAS_Hobart_%28D_39%29)