Definition of "deep sea" []

• The deeper part of the sea or ocean in which no light penetrates (noun)

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• "It often seemed to him as if he were floating in the air, and swimming between time and eternity in the deep sea of God's unfathomable marvellousness."
• "Although the earthquake in Kiangsu was far more extensive than the disaster in Louisiana it attracted little attention in the world press because everyone was used to catastrophes happening in China and the loss of some million lives did not seem very important; and besides, it was scientifically clear that it was only a tectonic earthquake to do with the deep sea trench near the Riukiu and Philippine archipelagoes."
• "Roosevelt bragged of teaching “neophyte” Callaghan the techniques of deep sea fishing during a cruise to the Galapagos Islands in the summer of 1938, see Geoffrey C."