The MV Seawolf is Adelaide's most recent club-driven wreck before the Andrew Wilson, sunk on 23 March 2002 as part of the Noarlunga artificial reef project. She began life in the 1940s as the Matsu Maru, a Japanese tuna vessel about 32 m long, and was donated to the Seawolves Dive Club, whose members spent years preparing her for scuttling. The club's own history describes the wreck as a much-needed and valuable resource for local divers.

She rests on her starboard side in about 20 m, 15-20 m astern and slightly to starboard of the HA Lumb, with her bow reaching into the Noarlunga Tyre Reef. Lying on her side, she presents the deck as a vertical wall and offers multiple easy access points into open spaces for trained divers. A dummy 'bomb' was placed on deck and Sea Wolves markers were set underneath, giving divers things to look for.

The seabed is fine silt, so visibility can be variable, and marine growth and fish numbers vary too. Over two decades the hull has gained sponges and ascidians, and leatherjackets, bullseyes, old wives, morwong and schools of small fish gather around it. Nudibranchs are found on the steel, as on the neighbouring Lumb.

The Seawolf is almost always dived in combination with the Lumb and the tyre reef: the three structures sit so close that a single tank covers them all, making this one of the best two-wreck dives in South Australia outside the Glenelg pair. It suits Advanced divers and those building wreck experience, and is a short, sheltered run from O'Sullivan Beach.

Boat access only. Launch at the O'Sullivan Beach boat ramp (off Galloway Road; large trailer park, toilets) and run about 5 minutes south to the Noarlunga artificial reef, roughly 2.5-3 km west of Port Noarlunga jetty. The HA Lumb, MV Seawolf and Noarlunga Tyre Reef lie together, so one anchor or shot can serve all three.

There are no public moorings; anchor in sand beside the wrecks, not on them, and leave a boat attendant with a dive flag. Operators from Adelaide sometimes run here from Glenelg on days when Holdfast Bay is poor.

The Noarlunga artificial reef sits in open gulf water off the southern metro coast. It is diveable in light winds, ideally easterlies or light northerlies; westerly and south-westerly winds build steep chop quickly and the summer sea breeze usually arrives late morning to early afternoon. Tidal currents are usually mild but noticeable on spring tides – neap dodge tides are best.

The seabed is fine silt, so visibility varies greatly: up to 15 m after calm weather, but much less after westerly blows, after rain (Onkaparinga River plume) or when divers stir the bottom. Being close to O'Sullivan Beach, it is a good fallback when further sites are too rough.

Descend near the HA Lumb, swim astern 15-20 m to the Seawolf and circuit it at 18-20 m. Look for the dummy 'bomb' on deck and the Sea Wolves markers underneath. Follow the bow into the tyre reef, then return to the anchor.

Air or EANx 32; penetration within wreck training limits only.

Sea Wolves Dive Club (club dives), Underwater Sports and Adelaide shop boats occasionally; commonly dived from private boats out of O'Sullivan Beach, usually with the HA Lumb.