When we think of the word "underwater", we often picture a serene blue world with little sound and a peaceful aura. However, there are many different synonyms for this word that can help describe this environment even further. Some of these synonyms include: submerged, subaquatic, subaqueous, aquatic, marine, oceanic, and deep-sea. Each of these words adds a unique twist to the experience of being underwater. "Submerged" gives a sense of diving deeper into the water, while "deep-sea" denotes an even more elusive, mysterious underwater world. "Aquatic" and "marine" focus on the animals and plants that call the water home. However you choose to describe it, the world underwater is one that holds endless beauty and wonder.