mike_s
Contributor
If you watch the video of the news story, 50 seconds in to the video they show a picture of the reef structures approved. It seems to be some type rock or artificial rock. They say they are going to drop 19 of them off of Pensacola Beach.
they looked like the "Reef Cakes" that Mike Rowe made on Dirty Jobs in one episode.
similar to these (see pic below and additional pics of other styles at http://www.reefball.org/reef_ball_styles.htm)