HMAS Swan is a purpose-sunk naval wreck in Geographe Bay that delivers a full-scale advanced wreck dive with towering exterior lines, open deck spaces, and diver-prepared swim-through routes cut through the hull. The wreck sits upright on sand with a slight list and offers enough structure to reward repeated visits, from the bridge and communications tower to machinery spaces and long sightlines down the ship's spine. Beyond the metalwork itself, the Swan has matured into an artificial reef packed with schooling fish, colourful growth, and resident predators, giving the site equal appeal for wreck enthusiasts, photographers, and marine-life-focused advanced divers.