Source : WordNet®

underwater
     adj 1: beneath the surface of the water; "submerged rocks" [syn: {submerged},
             {submersed}]
     2: growing or remaining under water; "viewing subaqueous fauna
        from a glass-bottomed boat"; "submerged leaves" [syn: {subaqueous},
         {subaquatic}, {submerged}, {submersed}]