When describing something taking place in the sea, there are a variety of synonyms that can be used to add depth and variety to one's language. "Marine" refers to anything related to the sea, while "oceanic" specifically denotes an event or object occurring in the ocean. "Aquatic" is a broad and versatile term that encompasses anything water-related, while "subaqueous" refers to anything that occurs below the surface of the water. Describing something as "abyssal" can denote its great depth, while "coastal" refers to anything situated along a shoreline. Lastly, "nautical" refers to things related to sailing or boating, which may be relevant when discussing activities occurring in the sea.