Ex-HMAS Adelaide was sunk off the NSW Central Coast in 2011 as an artificial reef. It is now closed to diving. This record is retained for historical and geographic reference; follow the current official notice linked below.

Closed: do not plan a diving visit.

The wreck sits in open water off Avoca Beach with no real shelter, so charters need a settled swell (generally under about 1.5 m) and moderate winds to run and to moor safely on the wreck. Current across the site can be moderate and is a significant factor in penetration planning. Visibility is best when the East Australian Current is running warm and clean; a cold-water upwelling or recent blow reduces it considerably.

Check current operating status before booking, as the site has been closed at times for storm damage or structural assessment.

Descend the mooring line to the bridge structure at about 20 m, explore the bridge (captain's chair, console, chart table), then move aft and down through the helicopter hangar and operations room at 24-28 m before finishing on the open decks or working back to the mooring for ascent and a safety stop; qualified/experienced divers with appropriate training may descend further to explore lower compartments and the sand at 32-36 m.

Recreational depth range (20-36 m) but with genuine overhead compartments; a wreck or penetration specialty and a torch are recommended for internal exploration; some compartments require guided access only.

Pro Dive Central Coast and Central Coast Divers run scheduled charters to the wreck from Terrigal Haven (advanced/deep certification required); the site has periodically been closed by NSW Crown Lands for structural or safety reasons, so trips should be confirmed before booking.