Dive with marine life · 2026 guide
The world's largest cuttlefish, gathering in tens of thousands at Whyalla each winter.
The Whyalla breeding aggregation runs approximately May to August, peaking in June and July. Individuals occur year-round elsewhere in southern waters.
These 5 sites are where giant australian cuttlefish encounters are best documented, with the operators who dive them.
1Sydney, New South Wales
Sydney's most-dived shore site — weedy seadragons, extraordinary macro life and multiple routes.
The site offers several distinct routes at different depths, which is why it sustains that popularity — divers who have dived it a hundred times still find new things.
Look for: Eastern Blue Groper, Giant Australian Cuttlefish, Nudibranchs, Port Jackson Shark
Full Bare Island guide →2Fleurieu Peninsula, South Australia
South Australia's best-known leafy seadragon site, beneath a long jetty on the Fleurieu Peninsula.
The old jetty's T-section at the seaward end is the main attraction. The structure carries dense growth, and the piles and their surroundings hold the seadragons the site is known for.
Look for: Giant Australian Cuttlefish, Leafy Seadragon, Striped Pyjama Squid, Weedy Seadragon
Diving Adelaide3Yorke Peninsula & Edithburgh, South Australia
One of the world's great muck dives — an unremarkable jetty hiding extraordinary small life.
Jetty sites are often described as easy because access is from shore. That can be misleading, and Edithburgh illustrates why: shallow does not mean trivial, and the best diving here happens at night.
Look for: Giant Australian Cuttlefish, Leafy Seadragon, Nudibranchs, Seahorses & Pipefish
Full Edithburgh Jetty guide →
4Whyalla, South Australia
Tens of thousands of giant Australian cuttlefish gathering to breed in a few metres of water.
South Australian tourism information identifies the main aggregation period as approximately May to August. The animals gather over shallow rocky reef within metres of the shore.
Look for: Giant Australian Cuttlefish
Full Whyalla Cuttlefish Aggregation guide →
5Fleurieu Peninsula, South Australia
A shore-accessible aquatic reserve reef reached via a jetty — South Australia's main training site.
It is an aquatic reserve, and the protection has produced abundant and approachable marine life on a reef only a short distance from suburban Adelaide.
Look for: Giant Australian Cuttlefish, Leafy Seadragon, Nudibranchs, Striped Pyjama Squid
Diving AdelaideSites are chosen from our dive-site database and ordered by how well documented they are: flagship status, the number of operators we have confirmed dive there, and the marine life recorded. Nobody pays to be listed.
No. Listings and order come from our research only. Businesses can ask us to correct their details, but not to change their position.
It is generated from the directory's latest research, checked in 2026. Conditions, operators and seasons change — confirm details with the operator before you book.