Fish Hook Bay at Rottnest Island provides a shallow, sheltered environment suitable for beginner divers and snorkellers. The site features a mix of reef and seagrass habitats with depths ranging from 1 to 10 metres, averaging 3 metres. Visibility typically reaches 10 to 20 metres, though conditions vary with weather. Access is by boat only. Divers should remain aware of potential surge in depths around 6 metres during moderate swells. General boat traffic is present in the area, and visitors should be mindful of sharks as part of the local marine environment. Typical dive times are approximately 45 minutes.

Shark Cave at Rottnest Island is an advanced dive site featuring a cavern and cave system. Located 1000 metres offshore, the site requires boat access and is exposed to weather, with dives restricted to conditions with swell under 1 metre and winds below 15 knots. Depths range from 10 to 26 metres. Divers must navigate an overhead environment, moderate to strong currents, and potential surge. Due to these factors, the site demands advanced buoyancy control and specific overhead environment training. Divers should carry a torch and time entries around slack water to manage currents effectively.

West Patch is a boat-access reef and cave site located 1000 metres off Rottnest Island. The topography features a mix of reef structures and caves, with depths ranging from 18 to 26 metres and an average of 20 metres. Divers should be prepared for moderate currents, surge, and potential thermoclines. Visibility varies between 4 and 15 metres. Due to the overhead environment within the caves and the presence of strong currents, this site is suited for intermediate divers. Proper buoyancy control is essential when navigating the cave systems, and carrying a light is recommended. Typical dive times are approximately 40 minutes.

Nurses Quarters at Rottnest Island is a reef and cave system requiring boat access. Divers explore depths ranging from 10 to 22 metres, with an average depth of 21 metres. The site is suited for advanced divers due to moderate currents and surge, which can be particularly active within the cave structures. Visibility typically ranges between 10 and 30 metres. Divers should time their entry around slack water to manage current and surge, as conditions can become more challenging when swell is present. A typical dive lasts 50 minutes. Given the overhead environment and potential for strong currents, excellent buoyancy control and situational awareness are required.

Horseshoe Reef at Rottnest Island is a boat-accessible site featuring a combination of open reef and cave topography. Suitable for beginners, the site reaches depths of up to 18 metres. Divers experience mild currents, though conditions can vary between visits. When exploring the cave section, it is important to remain close to the reef to maintain orientation. Due to active boat traffic in the area, divers must conduct a thorough surface check before ascending and exercise caution when entering or exiting the water. The site provides a varied underwater environment for those building their diving experience.

Swirl Reef at Rottnest Island offers a varied underwater landscape featuring both reef structures and cave sections. Divers can explore depths ranging from 4 to 24 metres, with an average depth of 15 metres. Access is strictly by boat, located 1600 metres from the shore. Conditions are variable, with visibility fluctuating between 3 and 20 metres and shifting currents. The site is suited for intermediate divers who can manage surge near cave openings. Hazards include sharp coral, which requires careful buoyancy control and attention to hand placement. Typical dives last approximately 50 minutes. Divers should remain mindful of surge during boat entry and exit procedures.

Duffield Ridge is a boat-access reef and cave site located 1500 metres off Rottnest Island. Designed for advanced divers, the site features depths ranging from 17 to 30 metres with an average of 26 metres. Divers navigate moderate currents and visibility typically between 5 and 10 metres. The topography includes reef structures and caves that provide shelter for various marine life. Be prepared for thermoclines and sudden temperature drops, which can occur even during summer months. Due to the depth and current, this site requires careful planning and close buddy contact throughout the dive.

Nancy Cove at Rottnest Island is a shallow, sheltered site ideal for beginners. The topography features a reef and a cave system, with depths ranging from 2 to 8 metres and an average of 5 metres. Visibility is typically between 15 and 30 metres, allowing for clear observation of the underwater terrain. Access is possible via boat or from the shore, located 100 metres out. Divers and snorkellers should be aware of potential surge near the cave entrance and remain cautious of boat traffic in the area. Facilities including parking and showers are available nearby. The site is generally calm, though sharp coral is present.