Old Mans Hat, Sponge Gardens
This Southern face of North Head slopes from the surface to a depth of about 22m where it meets the sand. Between 15m and the sand a profusion of sponges awaits the diver, with a number of swim-throughs, overhangs and wreckage from numerous shipwrecks.
In 18m of water on flat sandy bottom lies the wreck of the Barque, Centurion. She sank in January 1887 while being towed out through the Heads. There is not a lot remaining of the ship today, but the ballast, anchor chain, pieces of mast and ribbing still makes for an interesting dive. There are still a number of brass pins that held the ship together, and this is one of the few sites where the pineapple fish and red indian fish can be seen.