West Patch is a boat-access reef and cave dive in Western Australia that rewards intermediate divers with a solid mix of pelagic and benthic life across 18 to 26 metres. Visibility ranges from 4 to 15 metres depending on conditions, and moderate to strong current means you should plan your dive around the slack. The caves and overhangs shelter wobbegong sharks and Australian giant cuttlefish, while Port Jackson sharks and nurse sharks are regular fixtures on the reef structure. Keep an eye out for Australian sea lions, Western blue devils, harlequin fish, and Western rock lobster tucked into crevices. Western Australian dhufish round out the species list in the deeper sections.

Fish Hook Bay offers a gentle introduction to reef diving in Western Australia, with easy shallow waters reaching just 10 metres and visibility that can stretch to 20 metres on a good day. The reef supports coral gardens alongside a varied cast of marine life, including western blue devils, king wrasse, buffalo bream, and several ray species such as smooth, black, fiddler, and eagle rays. Sea stars, sea cucumbers, and nudibranchs are worth seeking out along the bottom, and dolphins occasionally pass through. Current is typically mild, making it manageable for newer divers. Watch for boat traffic and occasional surge near the reef.

Eagle Bay combines natural reef, a wreck, and artificial reef structures across a depth range of 6 to 32 metres, giving intermediate divers plenty to explore across multiple visits. Visibility runs 10 to 25 metres, though moderate currents require attention, particularly around the deeper sections where down-currents can develop. Australian sea lions are a genuine highlight here, curious and interactive by reputation. Port Jackson sharks, Australian giant cuttlefish, western blue groper, harlequin fish, and western rock lobster round out the regular cast. Watch your buoyancy near the bottom: stonefish, lionfish, and sea urchins are present and easy to miss.

Shark Cave earns its name. This boat-access site in Western Australia puts you in close proximity to grey nurse sharks and Port Jackson sharks, with wobbegongs typically settled on the bottom throughout the cavern environment. Depths run from 11 to 26 metres, with visibility ranging from 10 to 25 metres in the clearer conditions. Moderate to strong current moves through regularly, and surge adds an additional variable inside the overhead sections. Dhu fish, Western blue groupers, and smooth rays round out the marine life. The combination of depth, current, surge, and overhead environment means this site demands solid buoyancy control and genuine overhead environment experience before you drop in.

Horseshoe Reef is a beginner-friendly boat dive in Western Australia that combines open reef with a cave section, giving you variety without demanding much experience. Depths run from the surface down to 18 metres, so you can explore at a comfortable level while you build confidence. Visibility can be variable, so conditions do change between visits. The mild current keeps things manageable. What draws divers here is the resident wildlife: Australian sea lions, wobbegong sharks, Port Jackson sharks, bull rays, and Australian giant cuttlefish are all possible encounters, along with colourful harlequin fish, western blue devils, nudibranchs, and western rock lobster. Watch for boat traffic on the surface when ascending.

Duffield Ridge is a boat-access reef and cave dive in Western Australia that rewards advanced divers willing to work with its conditions. Depths run from 17 to 30 metres, and moderate current is the norm here, with thermoclines adding an extra variable to manage. Visibility sits between 5 and 10 metres, so navigation demands attention. The caves attract resting nurse sharks and Port Jackson sharks, while Western blue devils and Australian giant cuttlefish hold territory around the reef structure. Keep an eye on the sand and rock faces for nudibranchs and western rock lobsters. Samson fish and buffalo bream move through in the water column.

Swirl Reef combines a dynamic reef environment with cave sections, giving intermediate divers plenty to work with across depths of 4 to 24 metres. Visibility swings considerably, from 3 metres on rougher days up to 20 metres when conditions align, so timing your visit matters. Current is variable, and surge near the cave openings and sharp coral demand attentive buoyancy. The marine life mix leans characteristically Western Australian: Australian sea lions show up with their usual curiosity, while western blue devils and harlequin fish hold territory around the reef structure. Smooth rays, buffalo bream, western king wrasse, Australian giant cuttlefish, and western rock lobster round out what you can reasonably expect to encounter.

Nancy Cove is a calm, shallow site that works well for beginner divers and snorkellers. Depths run from 2 to 8 metres with no current to deal with, and visibility regularly reaches 15 to 30 metres, so you can see clearly across the reef and into the cave. The cave feature is worth exploring slowly as wobbegong sharks rest on the bottom and octopus tuck themselves into crevices. Out on the reef, keep an eye out for cuttlefish, snapper, buffalo bream, and western rock lobster. Surge can push you around near the cave entrance, so move steadily and stay aware of your position.