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
Now the earth was formless and empty, and darkness [was] over the face of the deep. And the Spirit of God [was] hovering over the surface of the waters.
Do not let the torrent of waters flood over me, or [the] deep swallow me, or the pit close its mouth over me.
They rose to the heavens; they plunged to [the] depths. Their soul melted in their calamity.
And they began imploring him that he would not order them to depart into the abyss.
or "Who will descend into the abyss?" (that is, to bring Christ up from the dead).
And the fifth angel blew the trumpet, and I saw a star that had fallen from heaven to the earth, and the key of the shaft of the abyss was given to him.
And when they have completed their testimony, the beast that comes up from the abyss will make war with them and will conquer them and will kill them.