Abstract: The invention is a special modified scuba diving apparatus intended for use by an animal, and more specifically the famous diving dog “Shadow.” The invention includes a helmet, a harness for supporting the helmet and a source of breathable gas, a special regulator providing a supply of breathable gas to the interior of the helmet, an exhaust for withdrawing exhaled air and residue water from the helmet without depressurizing the helmet, and a system of weights to compensate for the buoyancy of the user, and to counteract a net moment created about the center of buoyancy. The breathing system includes a muffler. An intercom system for providing voice instructions to Shadow can also be included.