Boat Harbour is a marine reef and cave system located in New South Wales, Australia. The site features depths ranging from 3 to 17 metres, with an average depth of 9 metres. Divers access the site via a shore entry, which can be hazardous due to surf and swell; it is not recommended when the swell exceeds 0.8 to 1.5 metres. Conditions include moderate currents and visibility between 5 and 15 metres, which may decrease following heavy rain. The site is exposed to the open ocean, requiring careful timing with the tides. Parking is available at the location.

Voo Doo is a boat-accessed site located 1100 metres off Boat Harbour, New South Wales. This advanced dive features a complex topography of reefs, walls, caves, and canyons reaching depths of 20 to 24 metres. Divers should be prepared for moderate currents and an overhead environment within the cave sections. Visibility typically ranges between 10 and 20 metres. Due to the depth and potential for strong currents, this site requires solid buoyancy control and careful air management. Species recorded around this area include Weedy Seadragons, Spotted Wobbegongs, Pygmy Pipehorses, and various rays. Always carry a light when exploring the cave and swim-through structures.

Voodoo Wide is a multi-feature dive site located 1100 metres off Boat Harbour, Australia. The topography includes a reef, wall, drop-off, and caverns, with depths ranging from 20 to 30 metres. Divers should expect moderate currents and surge, making this a boat-access site suited for advanced divers. Visibility typically ranges between 15 and 25 metres. Hazards include deep water, rip currents, strong surge, and sea urchins. Divers are advised to use a surface marker buoy and exercise caution near the wall and cavern structures. Water temperatures fluctuate between 18C and 23C throughout the year.

The Steps is a shore-entry reef dive located at Boat Harbour, New South Wales. The site features a reef environment ranging from 4 to 22 metres in depth, with an average of 11 metres. Divers can encounter species including the Weedy Seadragon, Smooth Ray, Common Sydney Octopus, and various sea stars, crabs, and sea hares. Snails and sea squirts are also present. This site is exposed to the open ocean, with moderate currents between 1 and 2 knots and potential for surge and surf. Due to these conditions, it is classified as an intermediate dive. Parking is available at the site.

Osborne Shoals is a reef and wall site located 2000 metres off Boat Harbour, New South Wales. The site features depths ranging from 11 to 24 metres, with an average depth of 18 metres. Divers encounter moderate currents, making this an advanced dive requiring drift technique. Visibility typically fluctuates between 5 and 12 metres. The site is accessible only by boat, and divers should be prepared for strong currents by using an SMB for ascent and staying close to the wall for shelter. Night diving is possible at this location, with typical dive times around 20 minutes.

The Hilda is a wreck dive located 200 metres off Boat Harbour, Australia. Resting at depths between 21 and 27 metres, the site features an intact hull and superstructure. This dive is suited for advanced divers due to moderate to strong currents that require a quick descent. Visibility typically ranges from 10 to 30 metres. Divers should be prepared for strong currents upon entry and exercise caution around sharp edges on the wreck structure. Boat access is required for this site, and local current predictions should be checked before planning a dive. Typical dive duration is approximately 30 minutes.

Wanderers is a deep reef and drop-off site located 5000 metres offshore from Boat Harbour. The topography features a wall with depths ranging from 34 to 46 metres, averaging 37 metres. This site is suited for advanced divers due to the depth, potential for decompression, and moderate currents. Visibility is highly variable, fluctuating between 5 and 30 metres. Divers should plan for a typical dive duration of 40 minutes and carry a surface marker buoy. Given the deep nature of the site and changing conditions, conservative gas management and close buddy contact are essential. Boat access is required to reach this location.

Tabbagai Gap in Kurnell features a combination of natural reef and artificial structures at depths between 18 and 24 metres. Divers encounter sponge gardens that provide habitat for various marine life, including wobbegong and Port Jackson sharks. Other species recorded here include weedy seadragons, eastern blue groper, blue devilfish, and Australian giant cuttlefish. Nudibranchs such as the splendid goniobranch and Bennett's hypselodoris are also present. This site is suited to advanced divers due to variable currents and visibility ranging from 10 to 30 metres. A boat is required for access, and divers should assess conditions carefully before entry, as surf can be a hazard.