

Best for intermediate divers, 5-36m, boat entry, mild current.
Crack a Jack is a reef and pinnacle site located at Agincourt Reef, offering depths between 5 and 36 metres with an average of 18 metres. The site features a reef wall that allows for varied profiles, from shallow snorkelling depths to deeper sections suitable for intermediate divers. Visibility typically ranges from 15 to 30 metres. Access is by boat only, and divers should be prepared for mild currents. The site is suitable for night diving. Divers should be aware of sharp coral and the presence of marine stingers between November and May, when full-body protective suits are recommended. Always deploy a surface marker buoy before ascending due to boat traffic.
-16.03310, 145.83250
The deeper sections below 25 metres are where the shark activity tends to concentrate, so plan a slow descent along the reef wall rather than dropping straight to the bottom and burning your bottom time. Make sure your surface marker buoy is ready before you ascend given the boat traffic.
Located 50 kilometres from shore on the outer Great Barrier Reef, accessible only via a full-day boat trip or liveaboard, primarily departing from Port Douglas.
Recorded at this site
Depth
5-36m
Visibility
15-30m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
25-29°C
Current
Mild
Typical Dive
50 min
Best Time
Jan, Feb, Mar, Apr, May, May, Jun, Jun, Jul, Jul, Aug, Aug, Sep, Sep, Oct, Oct, Nov, Dec
The site features schools of jacks, fusiliers, and glass fish. Divers may also encounter pygmy seahorses in gorgonian fans, marbled stingrays, sea snakes, and whitetip or grey reef sharks in the deeper sections.
The site is rated for intermediate divers, as it requires managing depths up to 36 metres and potential currents.
The site ranges from 5 to 36 metres, with an average depth of 18 metres.
Crack a Jack is located 50 kilometres from shore and requires a boat for access.
Yes, the reef structure begins at a depth of 5 metres, making the shallower sections accessible for snorkelling.
The site can be visited throughout the year, with water temperatures ranging from 25C in winter to 29C in summer.
Diving at Crack a Jack in Queensland requires the following certifications: Open Water. Always dive within your training limits.
Yes, equipment rental is available at or near Crack a Jack in Queensland. Contact local dive operators for specific gear availability and prices.
A 3mm wetsuit is recommended for diving at Crack a Jack in Queensland. Water temperatures range from 25°C to 29°C.
Divers at Crack a Jack in Queensland should be aware of jellyfish, sharks. These encounters are generally rare and avoidable with proper awareness. Follow local safety guidance and maintain a respectful distance from all marine life.
Crack a Jack in Queensland typically has mild currents that most divers can handle comfortably.
Visibility at Crack a Jack in Queensland typically ranges from 15 metres to 30 metres. Conditions vary with weather, tides, and seasons.