On an expedition to Alaska, Swiss photographer Michel Roggo caught his first glimpse of migrating salmon and resolved to return each year until he had captured good photographs of them underwater. After several failed attemps, Roggo perfected his technique for shooting underwater without having to dive. The advantage of this, says Roggo, is that ^fish are not really concerned about a housing on the river bed and it allows me to capture their natural behaviour^.

Using the technique he developed for salmon, Roggo began photographing other freshwater subjects, and has since become an award-winning leader in his field. His current project, Waterworlds focuses on freshwater landscapes and reveals these unique habitats for perhaps the first time.

^We know what coral reefs

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