12m – 18m
Castle Rock is located outside the Port Phillip Heads in approximately 18 metres of water. It sits on a sandy bottom and rises to around 12 metres. The rock is around 200m in circumference, has many overhangs, walls and swimthroughs, and can be circled several times in a dive. The fixed depth, lack of current and easy navigation makes this the perfect dive for Open Water divers. It is a wonderful fish dive, with a wide variety of creatures from Sea Dragons to Port Jackson sharks to be found on and around the Rock. There is even a slim chance of a cray or two under the overhangs at the bottom.