'Deep' in the Bible

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.

So the Lord God caused a deep sleep to fall upon the man, and he slept; then He took one of his ribs and closed up the flesh at that place.

In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on the same day all the fountains of the great deep burst open, and the floodgates of the sky were opened.

Also the fountains of the deep and the floodgates of the sky were closed, and the rain from the sky was restrained;

Now when the sun was going down, a deep sleep fell upon Abram; and behold, terror and great darkness fell upon him.

From the God of your father who helps you,And by the Almighty who blesses youWith blessings of heaven above,Blessings of the deep that lies beneath,Blessings of the breasts and of the womb.