Region: Terrigal, NSW
Skill Level: Intermediate
Depth: 18–36 m
Water Temperature: 18–24 °C
Visibility: 10–30 m
Best Time to Dive: September–May
Description: The HMAS Adelaide is a purpose-sunk ex-Royal Australian Navy guided missile frigate resting upright on the sandy seabed just off Terrigal. Scuttled in 2011, the 138-metre vessel has transformed into one of Australia’s most iconic artificial reefs. Her decks, passageways and control rooms now brim with marine life, offering divers an extraordinary blend of naval history and ocean biodiversity. The wreck sits in clear, temperate water and is accessible to qualified divers under permit.
Marine Life: The wreck supports dense growths of soft coral, sponges and kelp. Large schools of yellowtail, kingfish and sweep patrol the superstructure. Look for wobbegong sharks resting on the deck, eastern blue gropers cruising the hull, and the occasional grey nurse shark gliding through the shadows. Nudibranchs and pygmy leatherjackets inhabit the smaller recesses, adding bursts of colour to the steel corridors.
Hazards: Penetration diving presents entanglement and disorientation risks, entry is restricted to trained wreck divers with reels and torches. Depth and current can vary, and a safety stop is required on ascent. Fishing lines and loose cables occasionally hang from the structure.
Facilities: Terrigal Haven offers a boat ramp, parking, dive shop air fills, toilets and showers. Charter boats run regular trips from Terrigal Haven and The Haven Boat Ramp. Permits and tokens are available through local dive centres.