Underwater photography requires skill and is not a cakewalk for every photographic eye. There are special cameras available for underwater photography and these cameras have an external protective covering that protects the camera from getting spoiled or damaged. These protective casings are known as housings. Housings are waterproof casings or boxes designed to hold a camera such that it can be used underwater.
Housings are designed specifically for specific cameras and can be made of plastic or aluminum cases. The plastic housings are inexpensive when compared to those made of aluminum cases.