When getting more serious into underwater filming there are a couple things to think of. First of all you will probably want to upgrade from an action camera to a camera housing for the camera you use on land. To have the right gear when being underwater is important, and with gear I do not only mean camera gear, but also your diving gear. The most important thing when filming underwater is that you as a diver are safe and are already a good diver before concentrating on anything else under the water surface.
