Old Mans Hat gets its name from a flat rock that balances atop of the sheer cliff. To old timers the rock looked like a top hat. It’s a spectacular Sydney dive site. It features over 60 species of colourful soft corals and sponges and a large (45-degree angle) boulder field dropping down to a sand line at 18m to 23m.
Frogfish or anglerfish can be seen hiding in wait for their next meal among the coral that are shaped like bowls or vases. The striped anglerfish is the most common, but white-fingered anglerfish and (the black one) the white-spotted anglerfish are also seen on this dive. Anglerfish are very common around the harbour wharves, particularly at night.

