Subocean is a term used to describe something that is located below the surface of an ocean. There are many different synonyms that can be used to replace the word subocean, depending on the context in which it is being used. Some possible suggestions include underwater, marine, subaqueous, submerged, submersed, oceanic, or aquatic. These words all convey a similar meaning, but each has its own unique connotations and nuances. Whether describing a sunken ship, underwater cave, or exploring the depths of the ocean, choosing the right synonym can help to convey the sense of wonder and mystery that comes with exploring these vast and fascinating underwater worlds.