In the Bible, the word deep is used to describe an abyss or an immeasurable space below the oceans or in the depths of the earth.

Deep was used to describe how it was in the begining when God began to create.

Genesis 1: 2 states that darkness was upon the face of the deep.

I believe this darkness was an evil force because it opposed God’s created work.

The word deep in this verse describes the power and magnitude of this darkness. In fact, it must be powerful if it causes the earth to become null and void.

But, God control this darkness with the light.

Then God said, “Let there be light”; and there was light. And God saw the light, that it was good; and God divided the light from the darkness. (Genesis 1:3-4)

According to Dictionary.com, deep or Abyss also refers to anything that is endless such as a huge chasm or gorge or even the bottomless pit of hell.

During the great flood in the days of Noah, the Bible states that the fountains of the great deep were broken up (Genesis 7:11).

This verse means that the waters deep under the oceans gushed forcifully out upon the earth.

It was like massive tsunamis erupted on the sea coasts all over the earth. Imagine how terrifying these catastrophic events were!

Yet God was able to contain this great deluge and caused the waters to return to the storehouses of the deep (Psalms 33:7).

If God is able to control the deep darkness and contain the deep waters how much more is He able to deliver you from your afflictions; how much more He is able to deliver and protect you from the snares of the enemy.

There is no problem too difficult that God cannot solve.

As a matter of fact, if like the psalmist you sink into deep mire where there is no solid ground to stand on or if you find yourself in deep waters where the flood overflows you, cry out to God and He will hear you and deliver you because of His great mercy (Psalms 69)

For I know that the Lord is great, and our Lord is above all gods. Whatever the Lord pleases He does, in heaven and in earth, in the seas and in all deep places.
He causes the vapors to ascend from the ends of the earth; He makes lightning for the rain; He brings the wind out of His treasuries. (Psalms 135:5-7)

Are You not the One who dried up the sea,
The waters of the great deep; that made the depths of the sea a road for the redeemed to cross over? (Isaiah 51:10)

Arise, shine; For your light has come! and the glory of the Lord is risen upon you.
For behold, the darkness shall cover the earth, and deep darkness the people; But the Lord will arise over you, and His glory will be seen upon you.
The Gentiles shall come to your light, and kings to the brightness of your rising.(Isaiah 61:1-3)