Bunker Bay sits on the northern tip of Cape Naturaliste, where Geographe Bay meets the Indian Ocean. Marinelife.org.au describes a dive and snorkel from Shelley Beach to a small rock about 60 m offshore, with reef on its seaward side in about 5 m, and good snorkelling and diving along the shore toward West Point. It lists stingrays, bream, sweep, moonlighters, stripeys, coralfish, red-lipped morwong and prettyfish, a notable mix that reflects the warm Leeuwin Current reaching the cape. Meelup Park notes Bunker Bay's white sand and summer swimming.

The granite reef here supports sponges, weed and some corals, and the diversity of small reef fish is good for such a shallow site. The short swim makes it accessible to snorkellers and shore divers of all levels in calm conditions, while the shoreline toward West Point gives longer dives.

Bunker Bay is also within the Ngari Capes Marine Park, which has a Cape Naturaliste sanctuary zone nearby - check current zoning maps before fishing or collecting.

Geographe Bay faces north, so Cape Naturaliste blocks most of the prevailing south-westerly swell and sea breeze that close the ocean coast; that shelter and the warm Leeuwin Current make the Dunsborough shoreline one of the most reliably diveable stretches of the South West, and winter north-westerly storms are the main thing that shuts it down.

From Dunsborough follow Cape Naturaliste Road north-west about 13 km, then turn onto Bunker Bay Road. Park at the Shelley Beach/Bunker Bay car parks and walk down to the beach. Swim about 60 m out to the small rock, or snorkel along the shore toward West Point.

The nearest full-service dive shop for fills and hire is Swan Dive in Busselton; there is no dedicated dive shop in Margaret River or Augusta, so bring filled cylinders.

Bunker Bay faces north and is sheltered from the south-west, but it is close to the tip of Cape Naturaliste and can pick up swell wrapping around the cape; northerly winds also bring chop. Summer mornings are best. General pattern in Geographe Bay: sheltered from south-westerly swell by Cape Naturaliste; summer mornings are calm before the afternoon sea breeze, while winter north-westerly fronts roll swell and chop into the bay and reduce visibility for several days.

Swim from Shelley Beach to the small rock 60 m offshore, explore the reef on its seaward side at about 5 m, then follow the shoreline toward West Point before returning. Snorkellers should stay within easy reach of the exit point and swim with a buddy; scuba divers at these depths need no safety stop but should ascend slowly and surface near the float.

No operator needed - self-guided snorkel and shore dive. Swan Dive (Busselton) supplies hire gear and fills and can advise on conditions.