Life underwater is impressing, beautiful and relaxing. Many of those moments you experience in your diving career you want to share them with those non-diving-people, may it be your parents, friends, relatives or whoever you want to share them with.
Now it's possible, with an digital underwater camera. To be sure that the colors won't be lost when taking pictures, it's highly advised to use an underwater flashlight aswell. Even playing with wide-angle lenses or macro lenses will make your pictures even more pleasant to watch.