Explore Sydney underwater
Sydney Marine Life: Dive into Sydney’s Rich Underwater Biodiversity
Blue gropers that seem to come over for a look. Seadragons hidden along the kelp edge. Cuttlefish, octopuses and reef sharks in the right habitat. There is always more to notice when you slow down.
Nearly 600 fish species have been recorded from Sydney Harbour. The Australian Museum’s list counted 596 in August 2018, including species that live in the harbour, enter it or are known from historical records. That is a measure of biodiversity, not a list of animals a diver will see on one dive.
Sydney’s underwater world spans sheltered harbour coves, seagrass, kelp forests, sponge-covered reefs and offshore gutters. The sites around Botany Bay, Kurnell, Cronulla and Manly add another range of habitats. Together they make marine life diving rewarding in every season, while conditions and wildlife encounters change from day to day.
Marine Marvels Dives: learn to see more
On a Marine Marvels Dive, a marine biologist introduces the day’s wildlife or habitat theme, then guides a slower, more observant search underwater. After the dive, discuss what the group found and the behaviour, camouflage and ecology behind it. A seadragon theme might focus on the kelp edge; another event may explore different reef life.
Choose the live event that suits you: themes, sites, dates, prices and dive plans vary. These dives require at least Open Water certification, and the selected listing and conditions determine further suitability. Wildlife is wild, so sightings cannot be guaranteed.
See Marine Marvels themes and live dates
Check the individual event for certification, recent-diving requirements and equipment options before booking.
Where to look for marine life around Sydney
The right site depends on your training and experience as well as swell, tide, visibility and the day’s dive plan. These are habitat guides, not a promise of particular sightings.
Sydney Harbour and Camp Cove
Sheltered reef, sand and harbour habitat reward patient looking for small fish, leatherjackets, octopuses and sometimes seahorses. Camp Cove is inside the harbour, close to South Head.
Shelly Beach and Cabbage Tree Bay
On the Manly ocean side, kelp, reef and sand support blue gropers, cuttlefish, wobbegongs and smaller camouflaged life. This aquatic reserve is outside Sydney Harbour.
Bare Island and Botany Bay
Sponge gardens, ledges and sheltered pockets can reveal nudibranchs, octopuses, seahorses, red Indian fish and Port Jackson sharks. Conditions and the chosen route affect what is practical to see.
Kurnell: The Steps and Sutherland Point
Kelp edges and boulder reef are excellent places to search carefully for weedy seadragons, with blue gropers, cuttlefish and Port Jackson sharks also possible. The nearby Leap is a more demanding drift dive requiring appropriate experience.
Offshore reefs and Magic Point
For suitably qualified divers, Sydney’s coastal boat dives reach deeper reefs and gutters. Magic Point is an important grey nurse shark aggregation site, although shark presence and sea conditions vary.
Meet the animals beneath the surface
Explore these species guides, then choose a dive for the habitat you want to discover. Some are regular local reef animals; green turtles are occasional visitors, while Australian fur seals are more reliably encountered farther south around Montague Island.
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