Nothing really of interest in this reef - just a lot of concrete and tire units that have been sinking down into the mud for over twenty years. But someday ...
All manner of concrete, steel, and stone rubble from dredging, demolition projects, and other construction is used as artificial reef materials. This material is generally available at very low cost or free from construction companies who are more than happy to get rid of it. Transportation costs determine where this material is used by the Reef Program.
"Head boats" like the one shown are our major competition every morning - racing out to get to the best spots first. If you want to know why dive boats leave so god-awful early in the morning, this is one reason. Their behavior depends on the captain - many are friendly and accommodating, others are downright rude, and some won't even answer the radio. Dive boats sometimes recover lost anchors for the friendly boats, which can be quite a production, since some of them have very big anchors!