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.

Mindarie Reef offers a varied underwater landscape featuring reef structures, caves, and a canyon that descends to 30 metres. Located 5000 metres offshore, this site requires boat access and is suited to intermediate divers. Depths range from 6 to 30 metres with an average of 15 metres. Visibility typically fluctuates between 7 and 20 metres. Divers should be prepared for mild currents and potential surge, particularly within the shallower reef areas and canyons. Due to frequent boat traffic, including crayfish fishermen, the use of a surface marker buoy is essential during ascents and safety stops. Water temperatures range from 19C to 23C throughout the year.

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.

Gemini is an artificial reef wreck located off Cottesloe, Australia, resting at depths between 30 and 32 metres. This site is strictly for advanced divers due to the depth, potential for nitrogen narcosis, and the overhead environment presented by the wreck structure. Visibility is highly variable, ranging from 5 to 30 metres, and currents can fluctuate. Divers must manage decompression carefully and remain aware of entanglement risks within the structure. Boat access is required to reach the site, and the use of a surface marker buoy is essential due to local boat traffic. Typical bottom times are approximately 30 minutes.

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.