North Australian FISH FINDER TM forums

found these pics on a TackleWorld website. Don't know the details but Sydney Tanner, a underwater author of many scuba diving books, helped organised it.

Reef Balls are all the rage in NSW at the moment, they are putting new reefs of these concrete balls in their tidal lakes

They just put about half a dozen fancy ones in port phillip bay recently. I saw the co ords somewhere . Best to let the crowds have them. Shopping trolleys have a habit of finding there way to some strange places I'm told.