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Great Barrier Reef Australia.

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Designed for personalised dive and snorkel adventures, Poseidon Outer Reef Cruises departs daily from Port Douglas to visit 3 different and unique reef environments. Our range of over 30 spectacular and exclusive reef sites at the Agincourt ribbon reefs and Escape Reef, enables us to offer some of the very best day boat diving.

With clear outer reef waters, beautiful corals and incredible marine life diversity, the Agincourt ribbon reefs offer the opportunity to snorkel and dive in some of the most pristine and special places on the entire Great Barrier Reef. Enjoy unlimited snorkelling in this marine wilderness, first time divers can try an introductory scuba dive, and certified divers can experience up to three dives.

Poseidon has limited passenger numbers to ensure personalised service and attention. Whether you choose to snorkel or dive, with an amazing array of quality reef sites, attentive and friendly crew, the comforts aboard and our special permit to swim with the Dwarf Minke Whales, Poseidon offers you the perfect setting to enjoy a day on the Great Barrier Reef.


A cruise with Poseidon is all about having the opportunity to explore the magnificent coral gardens of the Agincourt ribbon reefs. Discover the vibrant fish life and delicate coral of three specifically chosen sites suited for conditions on the day of travel. The shallow reef lagoons are a great opportunity to see the Great Barrier Reef at its best, as some of the best coral growth is found in the shallower waters where sunlight is plentiful. For more experienced snorkellers, you'll be thrilled with exploring spectacular drop-offs and coral pinnacles.

If you haven't snorkelled before our crew will be on hand to give you instruction but we do recommend the ability to swim and a fairly good fitness level as snorkelling can be a strenuous activity.

The Reef Interpretation Talk and guided snorkel tour will give you an amazing insight about the reef and its inhabitants to help you truly appreciate what you are seeing.

Included in your day, join the Marine Biologist for a guided snorkel tour over the shallow coral gardens, pointing out fish and marine life, corals and areas of interest along the way.


Certified divers can enjoy up to 3 dives on a day dive excursion with Poseidon. This includes drift and wall dives, isolated pinnacles surrounded by pelagic fish and coral gardens with their endless variety of colourful wrasses, cods, parrot fish, clown fish, angel fish, clams and anemones, that make a healthy living reef so beautiful and exciting to dive. With our wide variety of quality sites at over 30 different reef locations, we choose the best three sites of the day according to weather and tidal conditions. We use of a dedicated dive tender for drift dives. All dives are guided at no extra charge and your Dive Master will brief you on the sites, equipment and safety procedures.

Introductory diving - As an introductory or first time diver, there is the choice to do an introductory dive at each of the 3 reef sites we visit on the day so you can experience 3 completely different reef environments. Or choose to spend part of your day diving and the rest snorkelling. There is plenty of time to enjoy both activities! After completing the necessary paper work which includes a medical questionnaire, you'll do a briefing and tuition with your instructor onboard. Then it's time to gear up and test your new skills on the vessels dive platform before heading off on your underwater adventure with your highly qualified instructor. Small groups ensure personal service and individual attention.

Introductory and certified dives attract an additional cost, per dive, on top of the rate for Cruise and Snorkel