The ability to breathe underwater is typically referred to as gills in aquatic animals such as fish, or as artificial devices like scuba equipment for humans. Humans do not have the natural ability to breathe underwater without assistance.
There is a such thing as ocean hunting in WOW its just not called ocean hunting. its called swimming underwater beating up everything you find. There is a hunter class, but they have no special abilities regarding water, nor special underwater pets.
An underwater vehicle built to resist pressure is called a submersible. These vehicles are designed to protect passengers and equipment from the immense pressure of deep-sea environments.
A special type of radar called sonar is used to detect objects underwater by emitting sound waves and detecting their reflections. Sonar is commonly used in applications such as navigation, communication with submarines, and mapping the ocean floor.
An underwater bubble blower.
Almost any camera can be used underwater if you buy a special case, called a skin, for it. Some Nikon cameras have special settings for underwater photography, making it easier to capture good pictures with the unusual lighting conditions underwater.
Areas of underwater ground are called seabeds or ocean floors.
The saddle used on a Bronco is called a 'Bronc Saddle'. There really is no other special name for the piece of equipment.
Point of connection to the electrical system for a particular piece of equipment, normally reserved for the exclusive use of the equipment, sometimes called a dedicated circuit.
Underwater sound detecting systems are called hydrophones. These devices are used to listen to and record sounds underwater, such as those produced by marine animals or underwater activities.
An underwater bomb is called a 'depth charge.
Being completely underwater is referred to as being submerged.