'Deep' in the Bible

He who made the [cluster of stars called] Pleiades and [the constellation] Orion,Who turns deep darkness into the morningAnd darkens the day into night,Who calls for the waters of the seaAnd pours them out on the surface of the earth,The Lord is His name.

Thus the Lord God showed me, and behold, the Lord God called for punishment with fire, and it devoured the great deep [underground sources of water] and began to consume the land.