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Selective color is a multi-step procedure in postproduction of images, allowing certain colors to be highlighted while removing color in the rest of the image. Underwater photographer John A. Ares gives us a step-by-step look at how one can use this unique effect to transform underwater images into artistic creations.

The oldest of the four large Comoros Islands, Mayotte is 295km west of Madagascar and 67km southeast of Anjouan. An overseas territory of France, it is surrounded by an elliptical barrier reef, 160km long, encircling a lagoon 5km to 10km wide, with a maximum depth of 80m, a dozen passes and dotted with a hundred coral islets.

Rico Besserdich is a widely published German artist, lecturer, photography instructor, writer, adjudicator and professional underwater photographer living in Turkey. His work has appeared in over 300 magazine and book publications around the world and has been translated into nine different languages.

Readers of my Scuba books often say how useful they find the stories I tell to illustrate key messages. The stories are all true. I wish I could say I made them up, but I am not that creative. Fortunately, life tends to be able to conjure up real situations that are far more instructive than those I could ever invent.

Lelle Malmström puts a drysuit neck seal through its paces by jumping of a 10m diving board to test if it holds tight.

Human factors is about making it easier to do the right thing and harder to do the wrong thing. Therefore, for divemasters, human factors is about making it easier for them and their divers to do the right thing and harder to do the wrong thing.

What is the origin of the unique lakes in the Volcanic Eifel region of Germany? In short, they were created from an explosion of water vapour when lava from a hot spot under the region met with groundwater thousands of years ago. The explosion created a round funnel, or crater, with earthen walls, which was later filled with rainwater. That is why the water is really clear and has rather good visibility.