There are dozens of special destinations around the world that are normally only dived by liveaboard vessels. Often these destinations are very remote and difficult to get to.

The Coral Sea & Ribbon Reefs is one of those destinations that is on many a diver’s bucket list. While the dive sites are very remote, the liveaboards depart from Cairns on the Queensland coast of Australia.

A couple of different liveaboard companies sail from Cairns on a week long dive vacation to the Ribbon Reefs a portion of the Great Barrier Reef and out to a remote reef, often Osprey reef, in the Coral Seas.

The liveaboards use different sailing dates and some will start with the ribbon Reefs and others will head to the Coral sea from Cairns.

The week long trip is presented in a three day Ribbon Reef Segment and a four day Coral Sea segment. Lizard island acts as a transfer point for guest taking only one segment.

Ribbon Reef Section

The Ribbon Reefs are a series of long narrow reefs stretching about 55 miles in the Northern Reef area of the Great Barrier Reef Marine Park. There are ten of these reefs, no names just numbered 1 to 10. They are to the north and east of Cooktown. Cooktown a town of about 2,000 is itself isolated, a five hour bus ride from Cairns with one trip a day.

The Ribbon Reefs are unique in their make up. They share the same characteristics of typical barrier reefs, on the edge of steep drop offs on the ocean side with calm shallow lagoons between them and land.

They do not have the broad flat tops that barrier reefs are known for.  Some scientist classify them as a separate reef type. Breaks between the reefs are few and often present a strong current.

It was these reefs that confounded Captain James Cook when he sailed to them. For the diver, they are perfect. The rich nutrients brought from the deep trenches causes the coral life to grown to immense sizes.

It also brings pelagic species in to visit and feed. The outgoing current flushed away any sediment and waste built up from the vast marine life. The impact caused by humans is not apparent.

They are far from any major human settlement and the pollution they can create.  Only a few small liveaboard visit the area each week. Cod Hole get special attention as it has a number of man sized 90 kg Potato Cods. Photographs and movies, In 1982, were used as part of a campaign to protect Potato Cod from commercial fishing.

Not only were the images highly successful to protect the Cod, they also prompted making the area a marine sanctuary. To divers around the world, it showed what a perfect reef looked like.

Over thirty years later, the visibility is still perfect, the marine life healthy and the Cod Hole dive site is still awing divers with perfect conditions and unbeatable marine life.

Coral Sea Diving-Osprey Reef

If you got a group of experience divers together and ask them to describe their dream dive and if you put all the answers together you have the Osprey reef. A ten hour boat ride from the Ribbon Reef, is a massive underwater mountain that reaches over 3,000 feet from the ocean floor to just under the surface.

The mountain top covers an area of about 195 square kilometres roughly 25 kilometres long and as wide as 12 kilometres. The central lagoon area is 30 metres deep at its deepest location with many dive sites as shallow as 10 metres.

Osprey reef has an atoll appearance to it, as the central lagoon is surrounded by coral above sea level. The floor of the lagoon has massive crevices in places.

One site got it name, Castles as the steep walled crevices and spirals create the image of a medieval town, with high walls and towers. Caves exist but inside and outside of the lagoon.

Outside of the atoll, the reef takes on a different look. 45 degree slopes to depths beyond diving limits, in other locations shear walls. Seemly unlimited visibility with pelagic fish in abundance.

The Osprey reef is one of the leading field research locations studying sharks. The variety and numbers of each specie is unmatched anywhere in the world.

A dwarf nautilus is also found in these waters. The nautilus lives in the deep hundreds of meters deep but on some nights venture into shallow waters. Some of the largest coral fans in the world have been cataloged here and it is also the home of the stout infantfish a previous record holder of the world’s smallest fish. The remoteness adds to the thrill of the diving. Unless there is a