These types of cameras are not to be confused with a normal camera that is used every day on land. An underwater camera is specially made to be able to be completely submerged underwater and able to take the pressure surrounding it and has a waterproof casing. The underwater camera also takes the same great quality pictures on dry land in rough and rugged conditions, but it has advanced features for a water setting.
Underwater cameras come in all shapes, sizes and film format. Many digital cameras that are made for the underwater environment come with a viewfinder so you can see exactly what you are taking a picture of and what your camera sees. There are still a great line of underwater cameras that use film that needs to be developed and they work just as well as a digital camera and take the same great picture. The smaller underwater cameras are normally very good for up to two hundred feet to four hundred feet while the bigger cameras are made for deeper regions of the waters.