The Ulidia was a 2,378-ton, 91 m steel ship, described by some sources as a full-rigged ship built in 1889 and by others as a three-masted barque. In February 1893 she grounded at Bunbury while unloading railway iron, and her captain's certificate was suspended. Two months later, under a replacement master, she tried to leave Gage Roads with a ballast of sand from Garden Island. She weighed anchor and sailed north to clear Rottnest, but the wind shifted to the north and forced her to tack. Unable to manoeuvre, she dropped anchor, the chain failed, and on 18 May 1893 she struck Stragglers Reef, holed and flooded quickly.

The wreck lies inside the reef in 3–6 m, with the bow against the reef and wreckage spread over about 99 m. It is heavily covered in weed and concretion, but in clear conditions the scale of the hull and its frames is impressive. Divingwawrecks notes that the site often has crystal-clear water.

The reef around the wreck holds buffalo bream, sweep, wrasse, herring cale and western rock lobster, and kelp grows thickly on the wreckage.

The Ulidia is exposed to swell, prone to strong current at times and is a navigation hazard for boats, so it can be dived only on calm days. On those days it is a shallow, bright wreck dive that suits Open Water divers and snorkellers from boats. Approach with care and watch where the swell breaks. It pairs naturally with the two Stragglers dredges to the west for a second, deeper dive.

Launch at Woodman Point (a run of about 6 nautical miles), Leeuwin Boat Ramp in East Fremantle or the Fremantle Fishing Boat Harbour ramps. Stragglers Rocks are the visible rocks roughly 4–6 nautical miles west of the Fremantle Harbour entrance, south-east of Rottnest's Bickley Point, on the edge of the Five Fathom Bank; the Mewstones lie to their south. The Ulidia lies inside Stragglers Reef about 600 m north-north-west of the rocks; the bow is at S 32°03.383' E 115°37.745'.

Approach from the east, following the sand patches and watching where the swell breaks. The sand around the stern section is the best anchorage.

Needs swell under 1 m, as the wreck lies in the break zone of Stragglers Reef. In good conditions there is excellent visibility with moderate surge; in any swell the site is dangerous for boats and divers. The Marine Life Network also notes heavy current at times.

Dive in the morning before the sea breeze.

Anchor in sand near the stern, descend and follow the wreckage along the reef towards the bow, which lies against the reef, then return along the sand edge to the anchor. Stay alert to surge in the shallows.

Occasional trips by Fremantle operators and clubs; private boats.