Elliot; that is indeed a ea snake, an olive sea snake to be exact. They are all around 4 to 6 feet long and rather fat. Very placid and curious critters. One of my favorites at the wreck.
Percula99: Some of the photos are black and white, i used this due to the nature of the site. The wreck lies in 100 feet of water at the base, and is relatively inshore, so the vis is usually only around 15 to 20 metres. Anything beyond about 3 metres away simply becomes a uniform dull greeny blue due to the depth. I was experimenting with black and white to focus on the silhouette over the colours.
Melev; the whole thing is all wreck, the yongala lies in 100 feet of water, in the middle of the 30 mile wide sandy channel between the reef and the shore, so anything solid you see it wreck.
This is why it acts like such a magnet to all the fish, because its the only large piece of structure for miles around. At just over 100 metres long its also a rather large ship, so getting a classic wreck shot it next to impossible due to the size and nature of the wreck (its completely encrusted in hundreds of different species of corals).
But yes, that photo is the wreck.