You would love the yongala, dive it in good weather as its quite exposed. lots of current at mid tide but the infatable charter dive boat that runs out a aye was there when we were and i think divers dived about 2 dives an hour either side of slack water. Lots of every conceivable GBR marine species and all very tame as its dived by 4 - 5000 divers per year.
The dive boat is probably fairly strict with its divers due to several acidents occuring over the past 15 years, top of wreck is 14 me ,bottom is 29 me. Vis for us on a totaly perfect day was 18-20me at the top and 8-10 at the bottom. Our dives done in our own time were about 45 mins each... I hope to dive it alot more next year.
i'm just heading out to sea for a couple of weeks so i will miss the scuba forum and flicker while i'm gone.