Australia's Most Remote Dive Sites in South Australia

The list is ordered by distance from the coast among sites recorded as expedition-only or rarely dived, so it is a list of Coral Sea reefs and the atolls off the Kimberley. That is fair: these are the most remote reefs in Australian waters, days from a port and further from a recompression chamber. But remoteness is not only distance. Bass Strait islands, the far south coast of Tasmania, the Great Australian Bight and the Nullarbor caves are remote in every practical sense and sit lower down only because they are near land.

Read the list alongside the under-the-radar ranking, which finds the quiet sites close to home, and the liveaboard category, which is how most divers actually reach the outer reefs.

The Cairns liveaboards run Osprey, Bougainville and Holmes reefs on three- to seven-night trips year-round, with the settled season from September to December. The reefs at the top of this list (Mellish, Lihou, Cato, Marion, Wreck Reef) need an expedition charter of ten days or more, typically out of Cairns, Gladstone or Bundaberg, and they are offered irregularly. Ask the Coral Sea operators about their long-range schedule a year ahead.

For the Rowley Shoals and Scott Reef, boats leave Broome from late September to November. Ashmore Reef is a Commonwealth reserve with permit access and no commercial diving. The Kimberley cruises visit the inshore reefs and the Lacepede Islands rather than the outer atolls.

The nearest chamber to the outer Coral Sea is Townsville, often more than 24 hours away by sea and aeromedical evacuation. Boats carry oxygen, and the good ones brief conservative profiles: no decompression, 30 m limits, long surface intervals, and no diving on the last day before a long steam. Diving insurance with evacuation cover (DAN or equivalent) is a booking condition on most vessels, and it should be. The safety guide covers what evacuation from remote Australia actually involves.