For great underwater digital cameras, there are a few brands that you can buy. However, one that stands out from the rest in particular in Canon. Canon makes their digital cameras from fine, 1st class materials for the best user experience possible and is always adding new and improving features to all digital cameras they make. Therefore, a Canon underwater digital camera is a great idea if you would like to capture some of the magnificence below water.
Although underwater digital cameras are able to take stunning underwater photography, many of them aren't waterproof models. These underwater digital cameras therefore require a protective layer, which is called housing, to cover it from the water. Acting basically as an extra outer protective coating that the camera sits in, just like fur on a cat keeps them warm, underwater cameras allow the same usage capabilities as a the camera would without the case. With different sizes and shapes in the market, but certain dimensions for your camera, the case chosen must perfectly fit the camera.
If you are looking for a relatively inexpensive camera case, then a plastic case may be just the material for you. However, if you have a larger wallet, you can't go past cases made from better materials such as aluminium. A wide-angled lense is just one option you will have with an underwater camera case. There are many other lenses which can also be used. It's really up to you.
Buying an underwater camera case? Great. Just make certain that the case which you are going to purchase will accommodate the camera you have fully. Knowing that you have bought a case which doesn't accommodate for your camera is a pretty bad feeling, so make sure that you get it right the first time. Your experience with your underwater camera will be at its best when your camera and its case are in harmony.