Reference: Deep And Depths
American
The deep, or the great deep, signifies in Scripture, hell, the place of punishment, the bottomless pit, Lu 8:31, compare Re 9:1; 11:7; the grave, Ro 10:7; the deepest parts of the sea, Ps 69:15; 107:26; chaos in the beginning of the world, Ge 1:2. See HELL.
See Verses Found in Dictionary
The earth was formless and void, and darkness was over the surface of the deep, and the Spirit of God was moving over the surface of the waters.
May the flood of water not overflow me Nor the deep swallow me up, Nor the pit shut its mouth on me.
They rose up to the heavens, they went down to the depths; Their soul melted away in their misery.
or 'WHO WILL DESCEND INTO THE ABYSS?' (that is, to bring Christ up from the dead)."
Then the fifth angel sounded, and I saw a star from heaven which had fallen to the earth; and the key of the bottomless pit was given to him.
When they have finished their testimony, the beast that comes up out of the abyss will make war with them, and overcome them and kill them.