In the underwater natural environment, a photographer is presented with a veritable new world. Its colours, forms, creatures and the way in which light behaves are unlike anything we are accustomed to on the surface. With the photographer gliding weightlessly through the underwater landscape, photography is very different in physical terms.

However, pretty well the same basic rules apply to underwater photography as above the surface. On the other hand, in technical terms underwater photography differs in three ways: in water, warmer light wavelengths are absorbed quickly, visibility is limited and flash power reduces dramatically as the distance increases.