Dive Site: Cod Hole

About Cod Hole

Cod Hole is a renowned dive site located at the northern end of Ribbon Reef #10, approximately 240 kilometers north of Cairns, Australia, within the Great Barrier Reef Marine Park. It gained international fame largely due to the presence of its resident giant potato cod, drawing divers from around the world to experience close encounters with these remarkable fish. As part of the Ribbon Reefs, this remote location is exclusively accessible via liveaboard dive tours departing from Cairns. The dive typically begins with an easy descent to a sandy bottom at around 8 meters, where divers can navigate towards a channel separating Ribbon 10 from Cormorant Reef. The site features vibrant coral gardens, deep coral walls, and protruding bommies. While exploring, divers are often joined by the inquisitive potato cod, which can reach up to 2 meters in length and weigh as much as 100 kilograms. The topography also allows for exploration of blue waters and, when currents permit, deeper areas where pygmy seahorses are rumored to reside. The site is teeming with diverse marine life. Beyond the impressive potato cod, you can expect to see large numbers of Humphead Maori Wrasse, which can grow to 2 meters long. Other common sightings include reef sharks, schooling sweetlips and snapper, coral trout, triggerfish, red bass, green turtles, and various anemonefish. During the Australian winter months of June and July, there's a chance to encounter dwarf minke whales cruising the Ribbon Reefs. Cod Hole is suitable for all experience levels, with generally gentle currents and excellent visibility often exceeding 25 meters. Entry is typically made directly from the boat. Liveaboard trips to this area often include multiple dives, providing ample opportunity to explore Cod Hole and other nearby Ribbon Reef sites.

Dive site facts: Cod Hole

Depth

5–30 m

Typical dive

16–18 m

Current

Gentle to limited

Visibility

20–30 m

Water temperature

22–30 °C

Entry

Boat / liveaboard

Level

All levels

Dive type

Reef, large marine life, pelagics, macro

Region / port

Great Barrier Reef, Queensland

Coordinates

-14.6667, 145.6333

Conditions & Currents

Cod Hole typically experiences gentle currents, contributing to a relaxed diving experience. However, on rare occasions, currents can be strong, particularly when venturing into deeper areas or channels. Entry into the water is usually made directly from the liveaboard boat.

Marine life & sighting chances

Potato Cod

common

Maori Wrasse

occasional

Humphead Parrotfish

occasional

Barracuda

occasional

Whitetip Reef Shark

occasional

Dwarf Minke Whale

June–July · occasional

Coral Trout

common

Sweetlips

common

Triggerfish

common

Trevally

common

Stingray

occasional

Angelfish

common

Lionfish

occasional

Moray Eel

occasional

Dive profile & how the dive runs

Access to Cod Hole is typically by liveaboard, mooring directly over the site. Dives begin with a descent to the main coral garden area, which sits at approximately 16 to 18 meters. The site consists of various coral formations interspersed with sandy channels, creating a natural arena for interactions with the resident potato cod. Divers explore these formations and channels, allowing the large groupers, often measuring up to 2 meters and over 100 kg, to approach closely. These interactions are a highlight, with cod often swimming directly towards divers before veering off. Other marine life, including Maori wrasse and humphead parrotfish, are also present. The dive usually progresses around the bommies and through the channels, maintaining a relatively consistent depth. Ascents are gradual, with safety stops conducted at 5 meters, often still in the presence of curious fish.

Underwater photography

Cod Hole offers exceptional wide-angle photography opportunities due to the large, habituated potato cod and other pelagic species. A wide-angle lens is essential to capture the impressive size of the groupers and the vibrant coral formations. Natural light is abundant due to good visibility and moderate depth, but strobes are highly recommended to bring out the true colors of the corals and marine life, especially in deeper sections or when shooting against the sun. When photographing the potato cod, maintain respectful distance and avoid aggressive pursuit; their curious nature means they will often approach you. Practice excellent buoyancy control to avoid contact with the delicate corals and disturbing the sandy bottom, which can reduce visibility for both photographers and other divers. Given the popularity of the site, be mindful of other divers and avoid obstructing their experience or creating a chaotic scene.

Combine with nearby dive sites

• Steve's Bommie

  A pinnacle rising from 30m, rich in soft corals and schooling fish, with macro life and pelagics.

• Pixie Pinnacle

  Another distinctive pinnacle dive site in the Ribbon Reefs.

• Ribbon Reef No. 9

  Features extensive hard coral fields and sandy gullies, with stingrays and whitetip reef sharks.

• Osprey Reef - North Horn

  Outer wall dives with deep drop-offs and pelagic action, accessible from Cairns liveaboards.

Getting there & logistics

Cod Hole is exclusively accessed via liveaboard trips departing from Cairns or Port Douglas. Typical itineraries range from 3-5 days to 7-night expeditions that cover the full chain of Ribbon Reefs, including Cod Hole. Travel time from Cairns to the southern Ribbon Reefs is approximately 6-8 hours, with Cod Hole on Ribbon Reef Number 10 requiring an overnight journey. Shorter trips might focus on specific areas, while longer ones often combine Cod Hole with other Ribbon Reef sites like Steve's Bommie and Pixie Pinnacle, as well as outer Coral Sea sites such as Osprey Reef. There are no specific permits or fees mentioned for diving Cod Hole beyond the liveaboard cost. Flights typically arrive at Cairns International Airport (CNS), which serves as the primary gateway to the northern Great Barrier Reef.

Safety & environment

Diving at Cod Hole generally presents conditions suitable for all diver levels due to gentle currents and excellent visibility. However, liveaboard diving requires self-sufficiency and good dive practices. The nearest recompression chamber is located in Cairns. Evacuation from the remote Ribbon Reefs typically involves a liveaboard returning to port or, in severe cases, helicopter transfer, both of which can take several hours depending on weather and sea conditions. Comprehensive dive insurance, including coverage for medical emergencies and evacuation, is essential. While the potato cod are habituated, it's crucial to remember they are wild animals; maintain respectful distances, avoid direct contact, and never attempt to feed them, as this can alter their natural behavior and pose risks. Always follow your dive guide's instructions regarding interactions with marine life.

Who it suits — and who it doesn't

FAQ

Cod Hole FAQ

Liveaboards diving Cod Hole

These liveaboards may visit Cod Hole on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Spoilsport

Australia

28 guests30 m

$406/day

Odyssey Liveaboard

Australia

20 guests24 m

$392/day