The Neptune Islands are a remote, boat-based dive site located in the open Southern Ocean. Diving here is conducted within protective cages due to the presence of great white sharks, bronze whaler sharks, and mako sharks. The topography features reef sections ranging from shallow depths down to 21 metres. Divers also encounter New Zealand fur seals and Australian sea lions. While the islands are exposed to strong currents and surf, operations take place in sheltered anchorages. Visibility typically ranges from 15 to 25 metres, though it can fluctuate. Water temperatures vary between 15C and 19C throughout the year. Guided tours are required for all dives.

The Neptune Islands offer boat-access diving across a mix of reef, seagrass, and drop-off topography. Divers can explore depths ranging from 2 to 20 metres, with an average depth of 15 metres. Visibility typically spans 15 to 20 metres. The site is suited for intermediate divers due to moderate, shifting currents and the requirement for boat entry. The diverse habitats support various temperate marine life, including reef fish and invertebrates. Water temperatures fluctuate between 15C and 19C throughout the year. Divers should remain vigilant regarding boat traffic, strong currents, and the presence of sharks. Facilities at the site include showers.