Billy's Basin is a cave dive located off Cottesloe, Australia, requiring boat access. The site features a cave structure with depths ranging from 12 to 18 metres, averaging 12 metres. Visibility is variable, typically between 10 and 30 metres. Due to the overhead environment and variable currents, this site is suited for intermediate divers with solid buoyancy control. Divers must be aware of hazards including boat traffic, potential entanglement from discarded fishing lines, and the overhead environment. A torch and surface marker buoy are essential equipment for this dive. Plan your visit around calmer current windows during the spring and autumn months.

The Apartments in Cottesloe is a structured reef system featuring stacked coral formations that create a series of caves and swim-throughs. The site ranges in depth from 8 to 18 metres, with an average of 12 metres. Divers should be prepared for surge, particularly in shallower sections, and remain aware of potential boat traffic at the surface. Visibility typically ranges between 10 and 15 metres. Due to the complex topography and variable currents, this site is suited for intermediate divers. Access is by boat only. Species recorded around this area include nudibranchs, wrasses, toadfish, cardinalfish, crabs, and various reef fish.

Burns Rock is a shallow reef site located 1500 metres offshore from Cottesloe, Australia. The site features depths ranging from 2 to 10 metres, with an average depth of 6 metres, making it suitable for beginner divers. The rock surfaces are covered in coralline algae. Access is by boat only, and divers should be aware of potential surge, particularly when swells exceed 1 metre. Due to the site being a popular boating area, surface boat traffic is a hazard, and the use of a dive flag is essential. Visibility typically ranges between 10 and 15 metres, with water temperatures varying from 19 to 23 degrees Celsius.

Bat Caves is a reef dive located off Cottesloe, Australia, offering depths between 5 and 25 metres. This site is suitable for beginners, though divers must be prepared for boat entry in surf conditions. Visibility typically ranges from 8 to 12 metres. While currents are generally mild, they can strengthen, requiring careful monitoring. Species recorded around this area include Ornate Wobbegong, Weedy Seadragon, Port Jackson Shark, Western Blue Devil, and various wrasses. Divers should check local surf forecasts and conditions before departure, as the environment can change quickly.

The Alkimos Wreck is a Greek cargo ship that ran aground off the coast of Cottesloe. Resting in shallow depths of 4 to 7 metres, this site is accessible for beginner divers via a 400-metre shore entry. The wreck structure remains the primary feature, though divers should exercise caution due to potential surge, moderate currents, and sharp coral growth on the hull. Visibility typically ranges between 3 and 5 metres. Given the shallow nature of the site, it is suitable for extended dives, though entry into the wreck itself is discouraged. Always monitor local conditions and exit the water if visibility or surge levels become hazardous.

North Lump is a deep wreck site located 18.5 kilometres off the coast of Cottesloe, Australia. The site features a wreck structure that serves as an artificial reef, with depths ranging from 26 to 42 metres and an average depth of 32 metres. Due to the depth and overhead environments within the wreck, this site is strictly for advanced divers. Divers must manage decompression stops, nitrogen narcosis, and entanglement risks carefully. Currents are variable and can shift unexpectedly. Boat access is required for this site, which typically involves a 20-minute dive duration. Visibility can be limited, and divers should be prepared for reduced light conditions during penetration.

Whitfords Rock is a reef site located off the coast of Cottesloe, Australia. This site is suitable for beginner divers, featuring mild currents and depths ranging to 25 metres. Access to the reef is by boat, and divers should remain aware of boat traffic in the area at all times. Due to the variable nature of the site, it is recommended to check recent conditions before planning a dive. Divers should descend slowly and maintain proximity to their guide, particularly in deeper sections. Always deploy a safety sausage upon surfacing to ensure visibility to passing vessels.

Wreck Rock in Cottesloe offers a varied dive experience combining reef structures and caves at depths between 7 and 25 metres. Located 1000 metres offshore, this site requires boat access and is suited for intermediate divers. Conditions include a mild current and visibility ranging from 3 to 10 metres. Divers should be aware of surge and swell, particularly when navigating the cave systems. Hazards at the site include sharp coral and potential entanglement risks from debris or fishing lines. Water temperatures fluctuate between 19C and 23C throughout the year. The site is supported by local facilities including parking, toilets, showers, and nearby boat charter services.