On August 11, 2026, the Australian Institute of Marine Science (AIMS) published its annual report on 121 reefs of the Great Barrier Reef. Hard coral cover has risen to 35.1% in the north and 31.6% in the central region. The south has declined slightly, to 26.4%.
These figures say nothing about your upcoming outing. Neither does a turquoise photo. So we apply our criteria to the destination: level, current, season, supervision, fallback plan.
What level is required to dive on the Great Barrier Reef?
The Great Barrier Reef welcomes both swimmers discovering snorkeling and experienced autonomous divers, but never on the same sites. Protected wrecks and isolated reefs of the Coral Sea require real offshore diving experience. The level is therefore decided outing by outing, with the operator.
The table below is indicative. It does not replace the briefing or the guide’s advice on site.
| Type of outing | Examples | Indicative level | Current | Supervision to request | Fallback plan |
|---|---|---|---|---|---|
| Day trip on an outer reef | Off Cairns and Port Douglas | Snorkeling, introductory dive, beginner with supervision | Variable, to be checked on the day | Instructors in the water, monitoring swimmers | Sheltered side of the reef |
| Cruise north of Cairns | Ribbon Reefs, Cod Hole | Autonomous, to be confirmed with the operator | Impossible to decide from here | Maximum depth announced at briefing | Sheltered site in the same area |
| Protected historic wreck | SS Yongala, south of Townsville | Set by the operator holding the permit | Variable, to be checked on the day | Operator with federal permit | Postponement of the outing |
| Isolated reef of the Coral Sea | Osprey Reef | Experienced diver | Impossible to decide from here | Guide familiar with the site | No nearby shelter |
The current decides more than the photo.
Departing from Cairns or Port Douglas, many day trips mix snorkelers, introductory divers, and certified divers on the same boat. This mix suits families. But it requires the team to monitor very different profiles. Ask how many instructors are in the water, for how many divers, and who stays on the surface for the swimmers. If the answer is vague, choose another boat. For a newly certified diver, the maximum depth announced at the briefing counts more than the site name.
Which sites to choose between Cairns, Townsville, and the Coral Sea?
The offers fall into three categories. There are the reefs off Cairns and Port Douglas, the Ribbon Reefs further north with Cod Hole, and the Yongala wreck south of Townsville. Osprey Reef, often sold in the same package, lies outside the marine park.
Osprey Reef depends on the Coral Sea Marine Park, managed by Parks Australia. The organization locates it on an isolated underwater mountain, more than 300 km from Cairns, with walls rising almost vertically from about 2,000 m depth. It is reached by a multi-day cruise. Parks Australia presents it as a site for experienced divers because of its isolation. And if the weather turns during the cruise, no sheltered site awaits you within an hour by boat.
The SS Yongala wreck sank in 1911 off Cape Bowling Green, south of Townsville. It is part of the protected historic wrecks of the park. According to the Reef Authority, a 797 m radius zone surrounds it and accessing it requires a permit from the federal Department of the Environment. You therefore go through an operator who holds it.
Cod Hole is known for its potato cod, although no encounter is guaranteed on any given day.
Further south, Heron Island belongs to the least favored sector according to AIMS. To understand how this reef formed, read our file on the Great Barrier Reef, the largest in the world. Still hesitating? Our selection of the best snorkeling destinations in the world applies the same caution.
When to go to avoid cyclones and jellyfish?
You can dive all year round, but two calendars overlap. The tropical cyclone season officially runs from November 1 to April 30, according to the Bureau of Meteorology. The jellyfish season (stinger season), riskier from November to May according to the Queensland government, covers almost the same period.
The two targeted species are the box jellyfish and the irukandji. The Queensland government reminds that they live year-round in its tropical waters. It advises wearing a full lycra suit and swimming inside jellyfish nets when available. In case of a sting, it recommends vinegar followed by a call to 000. Symptoms of an irukandji sting can appear 20 to 40 minutes later. When in doubt, consult a doctor.
This article provides information and does not replace the advice of a doctor specialized in diving medicine.
For more common jellyfish stings, our article on actions that relieve a jellyfish sting covers the topic, but in tropical Australia the official protocol involves vinegar and emergency services. However, nothing guarantees that your boat provides the lycra suit. Ask before booking.
Regarding water temperature, we did not find an official dated record. Ask the center which suit they recommend for your dates.
Zoning and marine park fees: what are the local rules?
The Great Barrier Reef Marine Park is divided into color-coded zones by the 2003 Zoning Plan, effective since 2004. In the green zones (Marine National Park), fishing is prohibited, but swimming, snorkeling, and sailing are allowed. Each visitor on a commercial trip pays an additional daily fee, the Environmental Management Charge (EMC).
According to the Reef Authority’s pricing page, updated April 8, 2026, the EMC is 8.50 Australian dollars per person for a full day, meaning a trip of three hours or more in the park, and 4.25 dollars for a shorter trip. From April 1, 2027, these amounts will increase to 9 and 4.50 dollars. Children under four years old traveling for free onboard do not have to pay, and it is the licensed operator who collects the fee and then transfers it to the organization. All the money goes to park management. Ask if it is included in the displayed price.
Osprey Reef is exempt from this system, as it falls under the Coral Sea Marine Park and Parks Australia.
Thus, on a multi-day cruise in the park, the fee is counted per day and per passenger. Respect the zoning even with a tank on your back. Do not take or touch anything, as explained in our article on reasons to never touch marine life.
What is the state of the reef after the 2024 bleaching?
The reef is slowly recovering from the massive 2024 bleaching, the fifth since 2016 according to AIMS. The report published on August 6, 2025, described the strongest annual decline ever measured in the north and south, and the one from August 11, 2026, shows stable or slightly increasing coverage in all three regions.
In 2025, hard coral cover dropped from 39.8% to 30.0% in the north. The south fell from 38.9% to 26.9%. During the 2025-2026 summer, the water remained 0.7 to 1.2 °C above average, and a regional bleaching event was declared in the Reef Authority’s northern management region. The late summer monsoon then cooled the water and, according to AIMS, likely limited the damage.
Bleaching can be seen in photos; mortality is measured the following year.
However, averages hide differences between reefs. In 2026, 16% of monitored reefs lost coral, 56% remained unchanged, and 28% gained coral. The 2024 losses mainly affected acropora, fast-growing corals sensitive to heat. The scenery you will see therefore depends on the reef chosen. Ask the operator where they dive this season. The crown-of-thorns starfish, which eats coral, was spotted on 27 monitored reefs in 2026, and our article on the giant triton tells of a potential way to slow it down.
Which visa to dive in Australia: eVisitor or ETA?
With a French passport, France Diplomatie indicates that an electronic eVisitor authorization (subclass 651) is required for a tourist stay of up to three months. The Australian Department of Home Affairs presents it as free, valid for 12 months, with a maximum of three months per entry (page updated on September 8, 2026).
Each family member, including children, submits their own application. No sticker is affixed in the passport. Confirmation arrives by email. The ETA (subclass 601) also exists for certain passports and costs 20 Australian dollars, according to the Spanish embassy in Canberra in its update of May 12, 2026. For another nationality, check your case on the Australian department’s website, without going through an intermediary.
Apply before paying for flights.
However, the visa remains the simple part. Traveling between November and April means accepting the cyclone season and the jellyfish season, so a lycra suit, sometimes canceled outings, and one or two buffer days before the return flight. Traveling from June to October places you outside these two seasons, without any guarantee about the wind of a given week. The price is paid in margin and days off.
Would you book it this way?
FAQ
Can you dive on the Great Barrier Reef without a certification?
Yes, in a guided introductory dive at a sheltered site. The professional on site decides if the day’s conditions are suitable.
When is the jellyfish season in Australia?
The risk is higher from November to May in the tropical waters of Queensland according to the state government, even though these jellyfish live there year-round. It advises a full lycra suit. In case of a sting, it recommends vinegar and calling 000.
How much is the fee to visit the Great Barrier Reef Marine Park?
The Environmental Management Charge is 8.50 Australian dollars per full day and 4.25 dollars for an outing of less than three hours, according to the Reef Authority in April 2026. It increases to 9 and 4.50 dollars on April 1, 2027.
Is a visa required to dive in Australia with a French passport?
Yes, an eVisitor authorization (subclass 651), free according to the Australian Department of Home Affairs. It covers a maximum of three months per entry. Each traveler, including children, submits their application.
Sources
- Annual Summary Report of Coral Reef Condition 2025/26 (Australian Institute of Marine Science, 2026)
- Know your zones on the Great Barrier Reef Marine Park (Great Barrier Reef Marine Park Authority, 2026)
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