You may know that Underwater Photography is the photo sessions under the water but i think you should also know that this is very hard to do. There is lot of danger of fishes and water creatures together with technical issues like loss of colors and contrast in the deep water. Color and Contrast values is inversely proportional to the dept of the water and scientifically the longer wavelengths of sunlight rays like red/orange are quickly enwrapped by the water layer, only color appeared to the naked human eyes are in blue-green in color. Photographers uses several techniques to overcome the issues created via atmospheric conditions and water.

How to Resolve the underwater issues:

Horizontal loss of color loss can be reduced by keeping the camera close to the subject and by the use of wide-angle lenses. In order to overcome the light issues and loss of colors photographers uses the flash (Fill-flash).

Despite these challenges there are excellent examples of underwater photography and some of them are  listed as follows:

Aggressive

Meditations

Tentacles

Amphiprion ocellaris

In the Air

Cooperative feeding in Humpback whales

Ray under the sun

Anemone Schrimp

Symbiosis

Kiss of the Mandarin