The Eliza Ramsden is an artificial reef wreck located 2000 metres offshore in the South Shipping Channel near Sorrento. Resting at depths between 14 and 22 metres, the site is suited for intermediate divers due to the requirement for precise timing. The wreck is subject to strong tidal currents, necessitating dives during slack water to ensure safety. Visibility ranges from 7 to 20 metres, with the clearest conditions typically occurring during the winter months. Divers must remain vigilant regarding heavy boat traffic in this active shipping channel. Access to the site is by boat only, with local charters and guided tours available for those planning a visit.

Nepean Bay is a shallow reef site located in Portsea, Australia, offering depths between 1 and 7 metres. This site is suitable for beginners, though it requires boat access and careful planning due to tidal influences. Divers should time their entry around slack water to avoid moderate to strong currents, which are most manageable on the ebb tide. Visibility typically ranges from 5 to 10 metres. Given the location within Port Phillip Bay, divers must remain aware of significant boat traffic throughout the dive. Water temperatures fluctuate between 13C and 19C throughout the year.

Flat Rock is a reef site located near Port Phillip Heads, offering depths between 12 and 25 metres. The topography features a mix of reef sections, caves, and overhangs, which require awareness of the overhead environment. Due to its proximity to the heads, the site is subject to moderate to strong tidal currents and surge; diving must be timed for slack water. Visibility is highly variable, ranging from 1 to 20 metres. Access is by boat only, and guided tours are available for those unfamiliar with the local conditions. The water temperature ranges from 13C to 18C, necessitating appropriate thermal protection.

Lonsdale Wall is a vertical reef and cave system located at the entrance to Port Phillip Bay. The wall drops from 12 to 45 metres, with an average depth of 25 metres. Due to its position in a high-velocity tidal zone, this site is strictly for advanced divers and requires boat access. Dives must be timed precisely for slack water to manage strong currents, and the site is often dived as a drift. Divers should be prepared for deep diving conditions, potential decompression requirements, and active shipping traffic. Visibility typically ranges from 5 to 15 metres, and water temperatures fluctuate between 13C and 18C throughout the year.

Boarfish Reef in Portsea is a drift dive site characterised by strong currents ranging from 1 to 4 knots. Divers explore the reef structure at depths between 10 and 22 metres, with an average depth of 16 metres. Due to the significant currents and proximity to the hazardous Port Phillip Heads area, this site is suited for intermediate divers with drift experience. Visibility typically fluctuates between 10 and 25 metres. Boat access is required, and divers must remain vigilant regarding heavy boat traffic and large ships in the vicinity. The use of a surface marker buoy is essential for safe ascents.

Cottage by the Sea is a shallow reef located 100 metres offshore from Portsea. This site features depths between 6 and 10 metres, with an average of 8 metres, making it suitable for beginners. Divers and snorkellers can expect visibility ranging from 10 to 30 metres. Access is via a shore entry, though users should shuffle their feet in the shore break to avoid stingrays. Conditions include moderate currents and potential boat traffic, requiring the use of a surface marker buoy. Water temperatures fluctuate between 13C and 19C throughout the year. Parking is available at the site, and night diving is permitted.

Cheviot Beach is a challenging shore dive located in Sorrento, Australia, suitable only for expert divers. The site features a reef environment at depths ranging from 5 to 15 metres. Conditions are demanding, characterised by strong permanent rip currents, surf, and surge. Surf Life Saving Australia rates the beach as extremely hazardous, and swimming is prohibited. Divers must navigate sharp coral and variable visibility. Access is via the shore, with parking available nearby. It is essential to scout the entry point carefully and time dives around slack periods, avoiding the site after recent swells. The site is best approached during the calmer months of December through May.

Catch Bag Reef is a boat-accessible site located in Portsea, Australia, featuring depths between 16 and 18 metres. This reef is a drift dive site, which must be conducted on the flood tide due to moderate to strong currents. Visibility ranges from 10 to 30 metres. Divers frequently encounter Western Blue Devil, wrasses, and sea stars. Other species recorded at the site include Port Jackson Shark, Southern Rock Lobster, Fiddler Ray, and various nudibranchs. Given the current, this site is suitable for intermediate divers who should plan their entry and exit to align with the water flow.