Reefballs: Components for Artificial Reef Construction.
The article describes about the use of artificial reefs. For decades people have been creating reefs from tyres, sunken ships, old cars, concrete culverts and assorted rubble. ReefBalls on the other hand, have been designed to emulate natural reef formations and, as most of the weight is concentrated in their flat bases, will sit on the sea floor without moving, even in turbulent seas. ReefBalls are made by pouring concrete into a fiberglass mould containing a central Polyform buoy surrounded by various sized inflatable balls to make holes.