Montague Island, The Gut
What a fantastic dive! Near perfect visibility, loads and loads of life - rays, sharks, wobbegongs, wrasse, large fish, eels.
At first the site looked quite barren - just large boulders with no plant life or sponges. This didn't seem to bother the truckload of large life that was loitering around though.
On the short snorkel back to the Nitro, we saw a ray on the bottom - we had enough air to go down and take a look. It turned out to be a quite large eagle ray sitting exposed on the rocks.