What a dive: The underwater realm that inspired James Cameron's new 3D film Sanctum
This is a real photograph from one of the most mysterious environments in the world
80ft below the surface, the Cascade room in Dan's Cave, on Abaco Island in the Bahamas, is one of the most sensational chambers in the cave system
No, it's not a still from Sanctum - although James Cameron's new diving film was inspired by a near-catastrophic expedition by the man who took these pictures, Wes C Skiles.
This is a real photograph from one of the most mysterious environments in the world. You could visit Abaco Island, in the Bahamas, and have no idea that beneath you lies this vast network of caves, accessible by as many as a thousand 'blue holes' - submerged vertical caves peppered with entrances to this forbidding domain.
Of the 1,000 or so blue holes in the Bahamas, fewer than 20 per cent have been investigated, and almost none fully explored
Exploring these passages is the diving equivalent of climbing K2 - you've got to be exceptionally well trained and well prepared. Even then, safety is no guarantee; Wes C Skiles died during a dive last summer. Sanctum is dedicated to him.
Divers maintain a taut safety line at all times. Without it, it could be nigh on impossible to find your way out before your air supply runs out. Divers carry three tanks of nitrox mix - one to use on the way in, one on the way out, and one for emergencies - and three lights, which are used to communicate as well as navigate.
Standard practice states that if any one light fails for any diver, the whole dive is called off.
In Sawmill Sink, another of Abaco's blue holes, bacteria colour the water a violent red, and signal the presence of hydrogen sulphide clouds
Wes Skiles died during a dive last summer. Sanctum is dedicated to him
Divers thread a careful path between stalactites and stalagmites in Dan's Cave. The fragile rock formations are tens of thousands of years old
Sactum Movie theatrical poster
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