Marine is defined as something related to water or the sea.
Below the level of the surrounding or adjoining area
Being, living, used, or carried on beneath the surface of the water, esp. of the sea
Find another word for undersea. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for undersea, like: marine, sunken, deep-sea, submarine, underwater and under-sea.