It may appear that every inch of Earth has been photographed countless times. Yet, the mysteries of the ocean still hold a unique opportunity for adventurous photographers. As oceanographer Paul Snelgrove said, "We know more about the surface of the Moon and about Mars than we do about the deep sea floor". Unlike space travel, bodies of water are accessible to just about everyone. No longer is expensive gear required to try out your sea legs. In fact, most camera manufacturers have inexpensive options for all experience levels. Read the full tutorial here.