un•der•wa•terPronunciation: (un'dur-wô'tur, -wot'ur), [key]
existing or occurring under water.
designed to be used under water.
located below a ship's waterline.
beneath the water: to travel underwater.
the water beneath the surface: cold currents in the underwater.
the depths, as of a sea, lake, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.