SS Yongala

A day here is built around one structure and one mooring. Boats run out from Alva Beach near Ayr, a short trip offshore, or make the longer passage from Townsville. You get two dives with a long surface interval spent floating directly above the wreck, and because the hull tops out around 16 metres while the sand beside it sits closer to 30, bottom time goes quickly: nitrox is common and operators plan around the tide rather than the clock.

The ship lies over on her starboard side on open sand, so a dive is a lap along one flank rather than a tour of decks. Descents are made hand over hand down the mooring line, and the usual plan is to drop onto the sheltered side, work the length of the hull out of the flow, then come back over the top with whatever time is left. Penetration is not part of it: the wreck is a protected historic site and a gravesite, nobody aboard survived the 1911 cyclone, entry into the hull is prohibited, and the surrounding zone is dived under permit through licensed operators.

The interest is in the contrast. A century of growth has turned steel plating into hard substrate, and coastal water does the rest: visibility runs green rather than blue, with river influence in it, so shapes resolve slowly as you work along the hull and a groper as long as a person can appear at conversational distance. The wreck went unidentified for decades after the sinking and was confirmed as the Yongala only in the late 1950s; legal protection followed, and taking anything off the site has been prohibited since.

It suits divers who are comfortable pulling themselves down a line into moving water and who would rather have large animals than pretty scenery. It is a poor choice as a first deep dive, or for anyone hoping to drift along sightseeing, and photographers should plan to work close and wide. Most people treat it as a dedicated overnight or two-day trip rather than an add-on, because sea state decides whether the boat goes at all and a spare day makes a cancelled morning survivable.