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
And the earth was without form and empty. And darkness was on the face of the deep. And the Spirit of God moved on the face of the waters.
Do not let the flood of waters overflow me, nor let the deep swallow me up, and let not the pit shut its mouth on me.
They mount up to the heavens, they go down again to the depths; their soul is melted because of trouble.
And they begged Him that He would not command them to go out into the abyss.
or "Who shall descend into the deep?"; that is, to bring up Christ again from the dead.
And the fifth angel sounded. And I saw a star fall from the heaven to the earth, and it was given the key of the abyss.
And when they complete their testimony, the beast coming up out of the abyss will make war against them and will overcome them and kill them.