Meaning of surface-to-underwater

sur•face-to-un•der•wa•ter

Pronunciation: (sûr'fis-t-un'dur-wô"tur, -wot"ur), [key]
— adj.
  1. (of a missile, message, etc.) traveling from the surface of the earth to a target underwater.
—adv.
  1. from the surface of the earth to a target underwater.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.