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.

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.

Spectacular Reef in Sorrento is a wall and drop-off site located 1000 metres offshore within a major shipping channel. The topography features shallow sections at 6 to 9 metres, with the main reef dropping to depths between 15 and 33 metres. Due to strong tidal currents, this site must be dived at slack water and is suitable for advanced divers only. Visibility ranges from 3 to 20 metres. Divers should be aware of significant boat traffic and use a surface marker buoy during ascent. The reef structure is characterised by ledges and crevices that support soft corals and sponges.

Queenscliff Bottle Drift is a drift dive located in the deeper waters of Port Phillip Heads near Sorrento. The site features a reef topography with depths ranging from 18 to 26 metres. Divers experience moderate currents, making this an intermediate-level dive best suited for those comfortable with drift procedures. Visibility typically ranges from 10 to 20 metres. Due to high boat traffic and shifting currents, boat access and guided tours are required. Species recorded around this area include Weedy Seadragons, Giant Cuttlefish, Fiddler Rays, and Western Blue Devils. Water temperatures fluctuate between 13C and 19C throughout the year, necessitating appropriate thermal protection.

Quarantine Station Wall is a shore-entry drift dive located in Sorrento, Australia. The site features a vertical wall ranging from 12 to 20 metres in depth. Divers experience moderate currents that carry them along the wall, with visibility typically between 10 and 30 metres. While suitable for beginners, the site requires careful planning due to the potential for strengthening currents and significant depth. Species recorded around this area include Giant Cuttlefish, Weedy Seadragon, Pot-bellied Seahorse, Blue-ringed Octopus, Fiddler Ray, Stonefish, Chromodoris Nudibranch, Western Blue Devil, Smooth Ray, Bobtail Squid, Long-nosed Fur Seal, Port Jackson Shark, and various wrasses.

London Bridge Rockpool in Sorrento is a shallow shore-entry site with depths ranging from 0 to 2 metres. This ocean-facing location is suitable for beginners, though it requires careful planning due to significant environmental hazards. The site is unpatrolled and features rough surf, strong currents, and unstable cliffs. Snorkelling should only be attempted at low tide during calm sea conditions to avoid waves washing over the rock platform. Visibility is variable, typically between 1 and 3 metres. Visitors should wear sturdy footwear to navigate slippery rocks and sharp surfaces during entry and exit. Parking and toilets are available at the site.

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.