The Saxon Ranger is Perth's purpose-sunk dive wreck, a 38 m steel trawler scuttled in Warnbro Sound as the centrepiece of what was promoted as the West Coast Dive Park. Built in the UK as the Atlantic Seal, she fished the North Atlantic until the early 1970s, then moved to Australia and worked from Albany and Tasmania. In 2003 she was driven ashore near Rockingham in a gale. After salvage she was cleaned, prepared and sunk as an artificial reef in 2006. Sources differ on details: the Marine Life Network describes her as a 400-tonne tuna vessel originally built as an icebreaker in the Second World War.

She sits upright in about 18–20 m on sand with the bow facing west; the wheelhouse was removed before sinking, so the top of the wreck is at about 11 m. The hull is intact and full of machinery, and holes were cut in the sides to let light in and give divers safe access. The steel is now covered in sea squirts, sponges and soft growth. Moonlighters, trevally and bullseyes school around the structure, and there are nudibranchs, octopus and small crustaceans on the hull.

Visibility varies and is often milky, and the interior silts quickly, so penetration needs care and training. Two public moorings with lines to the wreck make it easy to find and prevent anchor damage.

A permit from the Rockingham Visitor Centre is required, as for the HMAS Swan and HMAS Perth dive wrecks in the south of the state. It limits numbers to four divers per mooring for two hours.

The Saxon Ranger suits Advanced divers and Open Water divers under guidance who want an intact steel wreck close to shore, and it is a standard site for wreck and deep training.

Launch at the Bent Street ramp in Safety Bay (closest, just over a mile), or at the Carlisle Street, Donald Drive or Port Kennedy ramps. A yellow wreck marker is visible from the Bent Street ramp. Two public moorings with lines running down to the wreck are provided; do not anchor on the wreck.

Obtain the dive permit from the Rockingham Visitor Centre first: it covers up to four divers and allows two hours on the mooring.

Warnbro Sound gives partial shelter, but the site needs swell under about 1 m for comfortable mooring and decent visibility. Strong westerly and south-westerly winds and the afternoon summer sea breeze roughen the Sound; dive in the morning. Visibility is variable and often milky, ranging from 2 m to 10 m, and interior spaces silt quickly.

Descend the mooring line to the deck at about 11–14 m. Tour the hull from the bow (facing west) to the stern at 18–20 m on the sand, then return along the upper deck, looking into the holds and machinery spaces through the openings cut in the hull. Ascend the mooring line with a safety stop at 5 m.

Nitrox 28–32% extends bottom time. Penetration requires wreck training and a guideline.

Rockingham and Perth dive schools, including Perth Scuba and Dolphin Scuba, run regular boat dives and Advanced/wreck courses on it; private boats dive it under permit.