Where to Get Scuba Certified in Australia

Where you learn shapes the diver you become. Cairns courses put your four training dives on the Great Barrier Reef, while Sydney, Melbourne and Adelaide schools train you from the shore, under piers or from small boats in cooler water you can keep diving at home. The standard Open Water course prices we checked in October 2026 ran from $549 in Adelaide to $1,480 for a Cairns course with two nights on a liveaboard.

This guide compares the four most common places to learn, with shorter notes on Perth, Brisbane and the Gold Coast, and the Whitsundays.

Why the location matters as much as the agency

Most articles about where to learn to dive focus on choosing an agency, PADI vs SSI vs NAUI. The agency is the logo on your card. The location gets less attention, and arguably matters more.

Where you do your Open Water course shapes:

- Whether you fall in love with diving (or never do it again). - What conditions you become comfortable in: warm tropical reef, cool shore diving, pier diving or boat diving. - Which marine life you see on your first dives. - How much you spend: the standard course prices below run from $549 to $1,480, before any flights. - Whether your certification is a holiday or the start of a local diving habit.

The honest framing: Cairns is a holiday. Sydney, Melbourne and Adelaide are how locals build a real diving life. Both are valid. Pick by which one you actually want.

Quick comparison table

| | Cairns | Sydney | Melbourne | Adelaide | |---|---|---|---|---| | Course format | 2 days of pool and theory in town, then 2 reef day trips or 1 to 2 nights on a liveaboard | Online theory, a pool session, then 4 shore dives, over 2 to 3 days | Online theory, a pool session, then 4 dives, mostly under Mornington Peninsula piers, often with a boat dive | Theory, a pool session, then 4 shore dives at Port Noarlunga or 4 boat dives off Glenelg, over about 3 days | | Water temperature | About 22°C (August) to 29°C (January and February) | About 17 to 21°C (June to October), 21 to 25°C (January to April) | About 10°C (mid-August) to 20°C (mid-February) | About 11 to 15°C in winter, 19 to 23°C in summer | | What you wear | Lycra stinger suit from November to May (Divers Den) | 5 mm or 7 mm wetsuit | 7 mm wetsuit and hood at most schools | 7 mm wetsuit | | Standard course price (checked October 2026) | $1,045 to $1,480 | $595 to $895 | $849 to $999 | $549 to $699 | | Best for | Travellers, holidaymakers | Sydney locals starting a hobby | Melbourne locals, macro fans | Adelaide locals who want small groups |

Cairns and the Great Barrier Reef

Cairns courses are built for visitors. Every course we checked starts with two days at the dive school, theory in a classroom and skills in a pool, then heads to the outer reef for the four open water training dives. You either make two day trips and sleep on land, or spend one or two nights on a liveaboard dive boat.

Where you'll dive: Divers Den takes students to Norman, Saxon and Hastings reefs, about 90 minutes from Cairns. Pro Dive Cairns' liveaboard course dives Flynn, Thetford, Milln and Pellowe reefs, and its day-trip course, like Quicksilver Dive's courses, goes out from Port Douglas to the Agincourt Reefs.

Course format:

- Two days of classroom and pool training in Cairns or Port Douglas. Pro Dive Cairns trains in two heated, 4-metre-deep pools at its city training centre. - Do the theory online before you arrive and most schools cut a day: Quicksilver Dive's eLearning course takes three days, and Pro Dive's eLearning liveaboard course four. - Four open water training dives on the outer reef, over two day trips or one to two nights aboard. Pro Dive's five-day liveaboard course adds up to five more dives as a newly certified diver, including a night dive. - Queensland law requires every learner to fill in a medical declaration (the Diver Medical Participant Questionnaire) and, if the answers call for it, to bring a doctor's certificate before the training dives. Sort the form out before you fly.

Marine life on a typical course: Pro Dive Cairns lists giant clams, sea turtles, stingrays, reef sharks, a wide variety of tropical fish and coral on its outer reef sites.

Operators worth knowing about: Divers Den, Pro Dive Cairns and Quicksilver Dive (Port Douglas) all run PADI Open Water courses, and Pro Dive and Quicksilver Dive say you keep the same instructor throughout. Spirit of Freedom and Mike Ball Dive Expeditions run longer liveaboard trips to the Ribbon Reefs for certified divers and teach PADI Advanced Open Water on board. The full list is in our Cairns dive shop directory.

Pros:

- World-class marine life and a bucket-list backdrop. - Warm water all year. - Self-contained: you finish in three to five days. - Liveaboard prices include meals, and all three schools include hotel transfers.

Cons:

- Expensive: $1,045 to $1,480 for the course at standard prices (Divers Den has a $900 special until 30 March 2027), before flights and a bed in Cairns. - Intensive: four training dives in two days. - Weather-dependent: the cyclone season runs from November to April (Bureau of Meteorology), and Pro Dive warns that weather can change the number of dives. - Stingers: the Queensland Government says box jellyfish and Irukandji are in tropical Queensland waters all year, with the risk highest from November to May. Wear the lycra suit you are given. - You learn in warm, clear tropical water, which feels very different from a cool shore dive back home.

Best season: You can learn all year. In the wet season, build in a spare day.

Verdict: Pick Cairns if certification is part of an Australian holiday and you want the reef. Pick somewhere closer to home if you want to keep diving without flying.

Sydney and the NSW coast

Sydney is a weekend-and-weekday market, not a liveaboard one. You do the theory online at home, then a pool session, then four ocean training dives, almost always from the shore: Pro Dive says none of its training dives uses a boat.

Where you'll dive: Schools choose the site on the day to suit conditions. Shelly Beach in Manly sits inside Cabbage Tree Bay Aquatic Reserve, a no-take reserve, and is where Pro Dive Manly usually runs its course dives and Frog Dive usually finishes. Dive Centre Bondi does its first two ocean dives at Camp Cove inside the harbour. Gordons Bay and Clovelly in the eastern suburbs are on Pro Dive's training list, and Frog Dive usually spends its first ocean day at Clifton Gardens, on Chowder Bay.

Bare Island is closed. NSW National Parks closed the whole Bare Island precinct at La Perouse to all visitors from 24 August 2026 until about late 2027 for bridge repairs. Some course pages still list it, so ask your school which site it uses instead.

Once you are certified, Abyss rates Oak Park at Cronulla one of Sydney's best sites for newer divers, and Pro Dive calls the Monument at Kurnell very easy and beginner friendly.

Course format: 8 to 12 hours of online theory at home (Dive Centre Manly, Dive Centre Bondi and Abyss estimates), a pool session, then four shore dives. The practical part takes two days at Abyss and Dive Centre Manly, an evening plus two days at Pro Dive, and three days at Dive Centre Bondi and Frog Dive.

Marine life on a typical course: Eastern blue gropers, which may not be taken anywhere in NSW, are a highlight at Clovelly and Gordons Bay. Pro Dive lists seahorses, pipehorses and small cuttlefish at Clifton Gardens. Tim Barnes's Shelly Beach clip shows a blue groper swimming beside a diver and Port Jackson sharks resting on the sand.

Operators worth knowing about: Abyss Scuba Diving at Ramsgate, Dive Centre Manly and Dive Centre Bondi are all listed on PADI's dive centre locator as PADI 5 Star centres (Abyss as a 5 Star Career Development Center, the other two as 5 Star Instructor Development Centres). Frog Dive in Gladesville also teaches PADI, while Pro Dive (Sydney and Manly) now certifies through International Scuba Certification (ISC DIVER). Abyss and Dive Centre Manly cap Open Water groups at four students per instructor, Dive Centre Bondi at five and Pro Dive at six. The full list is in our Sydney dive shop directory. Our Learn to Dive in Sydney guide compares the five schools' prices, inclusions and training sites in detail.

Pros:

- Affordable: $595 (Frog Dive) to $895 (Dive Centre Bondi, and Dive Centre Manly's three-day course) at standard prices, with some dates discounted to $399. - Year-round courses, on weekdays or weekends. - You learn in the conditions you will dive in afterwards. - Support after the course: Abyss runs free guided shore dives from Friday to Sunday (tanks and hire gear extra), and Dive Centre Manly's course includes a month of dive club membership.

Cons:

- Cooler water: about 17 to 21°C from June to October. - Variable visibility: Pro Dive puts Shelly Beach at 3 to 15 m, usually clearer in winter. - A thicker suit: Pro Dive lends a 5 mm wetsuit and Dive Centre Bondi a 7 mm. - Extras vary: some schools charge for mask and snorkel hire, pool entry or transport, so compare the real total.

Best season: Year-round.

Verdict: The single best long-term choice for someone who lives in Sydney and wants to actually dive afterwards. Less spectacular than Cairns, more sustainable.

Melbourne and Port Phillip Bay

Melbourne courses centre on pier diving on the Mornington Peninsula, and many include a boat dive. The water is colder than Sydney's, and the small animals living under the piers are the reward.

Where you'll dive: Scuba Culture names Rye, Blairgowrie and Flinders piers as the popular training sites, and schools pick one on the day to suit the wind. Rye Pier is the one schools name most often; The Scuba Doctor puts its depth at 1 to 6 m. Blairgowrie Pier is 2 to 7 m deep and, The Scuba Doctor says, a mecca for nudibranchs, though diving inside the neighbouring yacht squadron marina is banned. Flinders Pier on Western Port, 1 to 6 m deep, is where Parks Victoria says you can see Victoria's marine emblem, the weedy seadragon; its repairs are finished and the full length is open again. Ocean Divers also runs pier dives at Brighton.

Portsea Pier is closed. Parks Victoria closed Portsea Pier and a buoyed zone of water around it from 17 August 2026 until further notice for major repairs, and suggests Rye Pier in the meantime. Berthing there is suspended too, so if your course boat normally leaves from Portsea, check where you meet it.

Course format: 6 to 12 hours of online theory (Diveline and Dive Gear Australia estimates), a pool session, then four dives in the sea. Diveline and Dive and Dive run three shore dives and one boat dive, Ocean Divers two pier dives then two boat dives, and Dive Gear Australia four shore dives. Bayplay and Dive and Dive fit the practical part into one long weekend; most other schools spread it over two weekends.

Marine life on a typical course: Diveline lists big-bellied and short-headed seahorses, octopus and anglerfish at Rye Pier. Each winter, giant spider crabs gather in huge groups in shallow water, often near Blairgowrie and Rye piers. Blue-ringed octopus live under these piers too: look, but never touch.

Operators worth knowing about: The seven schools we checked in October 2026 were Dive Gear Australia (Hallam, PADI), Aquatic Adventures (Rowville, SSI), Diveline Scuba Centre (Frankston, PADI), Ocean Divers (Bentleigh East, PADI), Dive and Dive (Braeside, PADI), Bayplay (Portsea, PADI) and Snorkel and Dive Safari (Altona, SDI). Every one asks you to bring at least your own mask, snorkel and boots. The full list is in our Melbourne dive shop directory.

Pros:

- Excellent small marine life under the piers, including seahorses and, at Flinders, weedy seadragons. - Sheltered piers with easy entries from the beach or a low landing (Parks Victoria bans jumping off piers such as Rye). - Weekend courses at local shops.

Cons:

- Cold: The Scuba Doctor says the water peaks around 20°C in mid-February and can drop to about 10°C in mid-August, and most local divers wear a 7 mm wetsuit with hood and gloves. - The dearest of the three southern cities: $849 to $999 at standard prices, plus your own mask, snorkel and boots. - Wind and tide can move course dates and sites. - Travel: The Scuba Doctor puts Rye about 90 minutes' drive from the city centre, more in summer.

Best season: All year, if you dress for it. The Scuba Doctor says winter visibility is often better, even though the water is coldest.

Verdict: The right pick for Melbourne residents who want to build a serious diving habit, especially photographers and critter-hunters. Cold, but the pier life makes it worth the wetsuit.

Adelaide and Gulf St Vincent

Adelaide has the lowest course prices of the four cities, but local diving has changed. Since March 2025 a harmful algal bloom has killed hundreds of thousands of fish and invertebrates on both sides of Gulf St Vincent, along with most of the sponges and soft corals on the jetty pylons, according to the Scuba Divers Federation of South Australia (SDFSA). Recovery is patchy, but the bloom itself has faded: in the week beginning 4 October 2026, all 21 metropolitan testing sites recorded zero or low levels.

Where you'll dive: Diving Adelaide calls Port Noarlunga South Australia's most frequented dive and an instructors' favourite for training: you walk your gear out along the jetty and climb down the stairs into about 3 to 6 m, inside a sanctuary zone of Encounter Marine Park. Adelaide Scuba runs all four course dives by boat from Glenelg North, and rates reefs such as Seacliff Reef and wrecks such as the Glenelg Dredge as suitable for Open Water divers. When the metro sites are blown out, Diving Adelaide may drive further, for example to Rapid Bay or Ardrossan.

Closures to know about:

- Rapid Bay: since 23 June 2025, the water beneath the old jetty and within 20 m of it has been a prohibited area under Notice to Mariners No. 41 of 2025, and the SDFSA notes fines of up to $10,000. Only the new jetty and the seagrass outside the buoys are open. - Edithburgh Jetty: closed to the public on 24 July 2026 for repairs and not due to reopen until mid-2027, according to Yorke Peninsula Council.

Seadragons are a bonus, not a promise. The leafy seadragon is South Australia's marine emblem, but the IUCN's seahorse, pipefish and seadragon specialist group reported thousands of leafy and weedy seadragons dead in the bloom. In March 2026, Divers for Climate's chief executive told InDaily that Rapid Bay used to have about 45 known resident leafies and that divers were now lucky to find one or two. Adelaide Scuba and Underwater Sports have paused their seadragon tours.

Course format: theory at home (eLearning at Diving Adelaide and Adelaide Scuba, printed homework and a classroom review at Underwater Sports), a pool session with a 200 m swim and a 10-minute float or tread, then four ocean dives. Diving Adelaide and Adelaide Scuba take about three days, Underwater Sports an evening plus two weekends.

Operators worth knowing about: Diving Adelaide at Marleston is listed on PADI's dive centre locator as a PADI 5 Star Instructor Development Centre. Adelaide Scuba at Glenelg North now teaches SSI, and Underwater Sports at Holden Hill teaches PADI. The full list is in our Adelaide dive shop directory.

Pros:

- The lowest prices of the four cities: $549 (Diving Adelaide) to $699 (Adelaide Scuba) at standard prices, with Diving Adelaide's group rates from $424 each. - Small groups: two students per instructor at Underwater Sports, four per class at Adelaide Scuba and up to five at Diving Adelaide. - A choice of shore training at Port Noarlunga or boat training off Glenelg.

Cons:

- Cold in winter: Adelaide Scuba gives 11 to 15°C and hires out 7 mm wetsuits. - The bloom has stripped colour from many jetties and reefs, and two famous sites are closed in whole or in part. - Conditions are still changing, so check the state government's weekly algal bloom results (algalbloom.sa.gov.au) and ask your school what its instructors are seeing.

Best season: All year; Adelaide Scuba's figures put the warmest water in summer, at 19 to 23°C.

Verdict: Still a good, affordable place to learn, with small groups and a choice of shore or boat training. Go for the training and the recovering reefs, not a guaranteed leafy seadragon.

Other places to learn: Perth, Brisbane and the Gold Coast, the Whitsundays

Four cities is not the full Australian list. Three more deserve a mention.

Perth: The six schools we checked charged $499 (Scubanautics, Rockingham) to $699 (Perth Scuba) in October 2026. Some do all four ocean dives from local beaches; Perth Scuba, ADRENO and Bucket List Diver's Premium course finish with two boat dives at Rottnest Island, and Perth Diving Academy starts on its house reef, Hillarys Wall. Mettams Pool at Trigg is not a training site: Parks and Wildlife describes it as a snorkelling and swimming spot, and none of the six schools uses it for scuba training. See our Perth dive shop directory, and the best places to dive in Western Australia for trips once you are certified.

Brisbane and the Gold Coast: The nine schools we checked in October 2026 charged from $495 plus $99 for the PADI e-book, eCard and registration (Queensland Scuba Diving Company, Gold Coast) to $999 (Adventure Moreton Island, or $1,099 for Friday and Saturday starts). Gold Coast schools train at Wave Break Island in the Broadwater, on offshore reefs and wrecks, or at the Tweed River's Jack Evans Boat Harbour; Brisbane courses include Moreton Bay boat dives, boat dives off Point Lookout, or the Tangalooma Wrecks off Moreton Island. Queensland's medical form rules apply here too. See our Brisbane and Gold Coast dive shop directories.

Airlie Beach and the Whitsundays: The course we checked, Whitsunday Dive Adventures' three-day PADI Open Water, costs from $1,250 (October 2026), with pool training at its Cannonvale centre and four boat dives around the Whitsunday Islands, in classes of up to six. It is a day-boat course rather than a liveaboard, and its price sits within the Cairns range: more than Divers Den's day-trip course ($1,045), a little less than Pro Dive's or Quicksilver Dive's ($1,310).

How to pick the city that suits you

Four quick decision shortcuts:

1. "I'm doing this on a holiday and want the bucket-list version." Cairns or Port Douglas, possibly the Whitsundays. 2. "I live in [Sydney/Melbourne/Adelaide/Perth/Brisbane] and want to actually dive afterwards." Your home city. Sustainability of the habit beats glamour of the certification photos. 3. "I care most about marine life." Cairns for the reef. Melbourne for seahorses under the piers and the winter spider crab gatherings. Sydney for blue gropers. In Adelaide, treat seadragons as a bonus while the gulf recovers from the bloom. 4. "I'm cost-sensitive and just want to get certified." Adelaide, Perth, Sydney or the Gold Coast. Cairns is the most expensive, especially after flights and accommodation.

The meta-advice: do not optimise for the certification experience itself, optimise for the diving life that follows it. A $699 Sydney course that gets used once a month for the next decade is a far better outcome than a $1,420 Cairns liveaboard course that never gets used again because cold-water shore diving back home felt like a different sport.

Questions to ask any operator before booking

Regardless of city, ask the dive shop these before paying:

1. How many students per instructor, in the pool and in the ocean? Agency maximums are higher than most people expect: PADI allows up to 10 students per instructor in confined water and 8 in open water (plus up to 4 more per certified assistant), SSI 8 in both, NAUI 10 and 8, SDI 8 and 6, and Queensland's dive code 8 in open water (10 with an assistant). These are ceilings, cut for children and poor conditions. Many schools publish smaller limits: four at Abyss and Dive Centre Manly, five at Dive Centre Bondi and Diving Adelaide. Ask for your usual group size and the most they will ever take. 2. Where exactly will my four open water dives happen? Not just the city, the specific sites. Check each one on the SDU dive-sites directory and make sure it is open: Bare Island, Portsea Pier, Edithburgh Jetty and Rapid Bay's old jetty are all closed in whole or in part. 3. What happens if weather cancels a dive day? Ask how dives are rescheduled, whether that costs extra and how long you have to finish. Pro Dive in Sydney, for example, asks you to finish within 90 days. 4. What's included, and what's extra? Common extras are your own mask, snorkel, boots and fins (every Melbourne school we checked asks you to bring at least a mask, snorkel and boots), pool entry and transport (extra at Pro Dive in Sydney), a plastic card ($25 at Perth Diving Academy), materials and registration ($99 at Queensland Scuba Diving Company) and a doctor's visit if your medical form calls for one. 5. Who is my actual instructor, and what is their experience? Senior instructors who teach regularly are a different proposition to brand-new instructors finishing their first cohort. 6. What's the post-course pathway? Advanced Open Water, Rescue, Nitrox, specialty courses, guided dives or a club. A shop with a clear continuing-education pipeline is more invested in your long-term diving.

A good operator answers all six questions in detail. A great one volunteers the answers before you ask.

Next steps

- Run yourself through Is Scuba Diving Right for Me? and How Fit Do You Need to Be to Scuba Dive? before you commit. - Check whether the medical questionnaire is going to need a doctor's visit, see Scuba Diving Medicals: What Conditions Will Disqualify You?. - Budget with How Much Does It Cost to Get Scuba Certified and How Long Does It Take to Get Scuba Certified. - Decide on agency, see PADI vs SSI vs NAUI, then approach two or three operators in your chosen city for a like-for-like quote. - Once you're enrolled, the Learn to Dive hub walks you through each phase of the course: theory, pool and open water. - Browse the SDU dive shop directory for the full list of training operators, filterable by state, agency and services.

Sources

- Divers Den: Four Day PADI Open Water Course - Divers Den: Five Day PADI Open Water Course - Divers Den: Where We Go - Divers Den: Frequently Asked Questions - Pro Dive Cairns: 5 Day Learn to Dive Open Water Course - Pro Dive Cairns: 4 Day eLearning PADI Open Water Course - Pro Dive Cairns: Weather and water temperature - Quicksilver Dive: 4 Day Learn to Dive - Quicksilver Dive: 3 Day Learn to Dive with eLearning - Spirit of Freedom: Liveaboard Dive Courses - Mike Ball Dive Expeditions: Courses - Queensland Legislation: Safety in Recreational Water Activities Regulation 2024 - WorkSafe Queensland: Recreational Diving, Recreational Technical Diving and Snorkelling Code of Practice 2024 (worksafe.qld.gov.au, PDF) - Queensland Government: Dangerous marine life - Bureau of Meteorology: Tropical cyclone climatology - Abyss Scuba Diving: PADI Open Water Course - Abyss Scuba Diving: Best Sydney Dive Sites - Abyss Scuba Diving: Sydney diving conditions and water temperatures - Abyss Scuba Diving: Free Guided Shore Dives - Pro Dive: Learn to Dive Sydney - Pro Dive: Learn to Dive Manly - Pro Dive: Shelly Beach dive site - Pro Dive: Clifton Gardens dive site - Pro Dive: The Monument dive site - Dive Centre Bondi: PADI Open Water Course - Frog Dive: PADI Open Water Diver course - Dive Centre Manly: PADI Open Water Course and FAQs, divesydney.com.au (blocks automated requests; read in a browser on 13 October 2026) - PADI: Abyss Scuba Diving, dive centre listing - PADI: Dive Centre Manly, dive centre listing - PADI: Dive Centre Bondi, dive centre listing - PADI: Diving Adelaide, dive centre listing - ISC DIVER: International Scuba Certification - NSW DPIRD: Cabbage Tree Bay Aquatic Reserve, dpird.nsw.gov.au (blocks automated requests; read in a browser on 13 October 2026) - NSW DPIRD: Bronte-Coogee Aquatic Reserve, dpird.nsw.gov.au (blocks automated requests; read in a browser on 13 October 2026) - NSW Environment and Heritage: Bare Island Bridge closes for essential restoration - Tim Barnes: Scubadownunder dive Shelly Beach Manly (YouTube) - Scuba Culture: Learn to Dive - The Scuba Doctor: FAQs About Melbourne Diving and Melbourne Pier Dives, scubadoctor.com.au (blocks automated requests; read in a browser on 14 October 2026) - Diveline Scuba Centre: PADI Open Water Diver Course - Diveline Scuba Centre: Rye Pier - Ocean Divers: Open Water - Dive Gear Australia: PADI Open Water Diver Course - Dive and Dive: Open Water Diver Course - Aquatic Adventures: SSI Open Water Diver - Bayplay: PADI Open Water Course - Snorkel and Dive Safari: Open Water Scuba Diver Course - Blairgowrie Yacht Squadron: Marina Rules - Parks Victoria: Rye Pier - Parks Victoria: Flinders Pier Project - Parks Victoria: Notice to Mariners 386(T) 2026, Portsea Pier closed for maintenance works - Parks Victoria: Portsea Pier - Marine and Coasts Victoria: Giant spider crab, Port Phillip Bay Environmental Management Plan, marineandcoasts.vic.gov.au (blocks automated requests; read on 14 October 2026) - Diving Adelaide: PADI Open Water Diver Course - Diving Adelaide: Port Noarlunga Jetty and Reef - Department for Environment and Water: Encounter Marine Park Management Plan 2012 - Adelaide Scuba: Open Water Diver course, Boat Diving and Diving in SA pages, adelaidescuba.com.au, and its SSI Open Water booking page, adelaidescuba.rezdy.com (block plain scripts; read 14 October 2026) - Underwater Sports Diving Centre: Learn to Scuba Dive in Adelaide - Underwater Sports Diving Centre: Leafy Sea Dragon Tours - Scuba Divers Federation of SA: Algal Bloom in South Australia, Supporting SA's Jetties, and newsletters of 2025 and 2026, sdfsa.net (blocks plain scripts; read 14 October 2026) - Government of South Australia: Algal Bloom Update, results for the week beginning 4 October 2026, algalbloom.sa.gov.au (blocks plain scripts; read 14 October 2026) - Marine Safety SA: Notice to Mariners No 41 of 2025 (Temporary), marinesafety.sa.gov.au (blocks plain scripts; read 14 October 2026) - Yorke Peninsula Council: Ardrossan and Edithburgh jetty works update - IUCN SSC Seahorse, Pipefish and Seadragon Specialist Group: Thousands of seadragons dead in South Australia's worst recorded harmful algal bloom - InDaily: State emblem seadragon disappears from diving hotspot - Perth Scuba: Open Water Diver Beginner Course - Perth Diving Academy: Open Water 20 (Level 1) - Perth Scuba: Is Perth Good for Beginner Scuba Divers? - Bucket List Diver: PADI Open Water course, Perth - Scubanautics Diving Academy: PADI Open Water Diver booking page, scubanauticsdivingacademy.rezdy.com (blocks simple scripts; read 14 October 2026) - Parks and Wildlife Service WA: Marmion Marine Park - Queensland Scuba Diving Company: PADI Open Water Course - Adventure Moreton Island: PADI Open Water Course booking page, adventuremoretonisland.rezdy.com (blocks simple scripts; read 14 October 2026) - Aqua Adventures: PADI Open Water course, Gold Coast - Kirra Dive: Open Water Scuba Course - Adreno: SSI Open Water Diver Course, Adreno Brisbane - Manta Lodge: SSI Open Water Diver Course - Gold Coast Dive Adventures: Courses - Whitsunday Dive Adventures: PADI Open Water Diver Course, Airlie Beach, whitsundaydiveadventures.com (blocks simple scripts; read with a browser user agent on 14 October 2026) - SSI: Open Water Diver (ISO 24801-2) training standard - NAUI: Standards and Policies Manual, 2026 edition - SDI: Standards and Procedures, Part 2, Diver Standards - PADI: Instructor Manual, 2021 edition

Header photo: Camp Cove beach at Watsons Bay, Sydney, a sheltered harbour beach used for Open Water training dives, seen from the lookout, by Ymblanter, CC BY-SA 4.0, via Wikimedia Commons.