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.

Eagle Bay at Rottnest Island offers a diverse underwater environment featuring natural reef, a wreck, and artificial reef structures. Divers can explore depths ranging from 6 to 32 metres, with an average depth of 15 metres. Visibility typically spans 10 to 25 metres. The site is suited for intermediate divers due to moderate currents and the potential for down currents, particularly near the wreck. Shore and boat entries are both possible. When entering from the shore, shuffle your feet to avoid stonefish and sea urchins. Divers should remain aware of strong currents and maintain a safe distance from lionfish and sharks.

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.

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.

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.

The City of York is a historic wreck located 200 metres offshore at Rottnest Island. Resting in shallow waters between 4 and 9 metres deep, this site is suitable for beginners. Divers explore the wreck structure and surrounding reef, which feature sponges and various marine life including crayfish, Western Blue Devil, Western Dhufish, Western King Wrasse, and Australian Giant Cuttlefish. Conditions are generally manageable with a mild current, though visibility varies significantly from 3 to 20 metres depending on weather. Boat access is required to reach the site. Divers should exercise caution regarding sharp coral and potential entanglement hazards within the wreck structure, while also monitoring surf conditions before entry.

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.