Dive Shop
Featured Products

Hyperion Standard Ball Arm Kit
Hyperion Standard Ball Arm Kit
$139.00 $132.00
Get $7.00 (5%) Off


Probe iDry Quick-Dry Dive Gloves - 2.0mm (Unisex)
Probe iDry Quick-Dry Dive Gloves - 2.0mm (Unisex)
$70.00 $63.00
Get $7.00 (10%) Off


Light & Motion Sola Dive 2000 Spot/Flood Light
Light & Motion Sola Dive 2000 Spot/Flood Light
$699.00 $629.00
Get $70.00 (10%) Off


Castle Rock

Bommie DiveBommie Dive | Boat access

Crayfish Dive Site Open Water Rated Outside Port Phillip Reef Dive Site

Castle Rock
Castle Rock | © Phil Watson

Depth: 12 metres (39 feet) to 20 metres (66 feet)

Castle Rock is located outside Port Phillip Heads on the south west side in approximately 20 metres (66 feet) of water. It rises majestically out of a sandy bottom to around 12 metres (39 feet) on top.

The walls of this bommie have many undercuts, splits and ledges and with jagged rock turrets on top it's easy to see how this site got its name! The rock is around 200 metres (656 feet) in circumference and can be circled once or twice in a dive. The fixed depth, lack of current and easy navigation makes this the perfect boat dive for newer Open Water divers.

But don't spend all of your dive time just exploring the base of Castle Rock. There is a lot of very interesting marine life to be found on the top.

Castle Rock is a wonderful dive with a wide variety of creatures from Nudibranchs to Seastars, numerous fish life including Blue Devils hiding under the ledges and a possible sighting of Weedy Seadragons to be found under and around the rock. There is even a slim chance of a Cray or two under ledges at the bottom, or in nearby reef.

Divers have the opportunity to catch crayfish (Southern Rock Lobster) at this dive site. Remember your catch bag, current Victorian Recreational Fishing Licence, rock lobster measure, and cray tags. Please abide by all current fishing regulations if you intend to catch crays. See How To Catch Crayfish for practical cray hunting advice from The Scuba Doctor.

Latitude: 38° 17.887′ S   (38.298117° S / 38° 17′ 53.22″ S)
Longitude: 144° 35.863′ E   (144.597717° E / 144° 35′ 51.78″ E)

Datum: WGS84 | Google Map
Added: 2012-07-22 01:00:00 GMT, Last updated: 2019-05-28 04:51:05 GMT
Source: Peter Fear GPS (verified)
Nearest Neighbour: Deep Pinnacles, 250 m, bearing 287°, WNW
Depth: 12 to 20 m.
Dive only on: Ebb.



DISCLAIMER: No claim is made by The Scuba Doctor as to the accuracy of the dive site coordinates listed here. Should anyone decide to use these GPS marks to locate and dive on a site, they do so entirely at their own risk. Always verify against other sources.

The marks come from numerous sources including commercial operators, independent dive clubs, reference works, and active divers. Some are known to be accurate, while others may not be. Some GPS marks may even have come from maps using the AGD66 datum, and thus may need be converted to the WGS84 datum. To distinguish between the possible accuracy of the dive site marks, we've tried to give each mark a source of GPS, Google Earth, or unknown.

Suunto D5 at The Scuba Doctor Dive Shop

Oops I did it again.
— Gary Busey