The flood story is an important one in the history of salvation. Apart from what has already been said here, some additional thoughts:
This is the third creation story in Genesis. The first is Genesis 1:1-2:5, which recounts the Generations of Creation. The second is Genesis 2:6-5:31, which recounts the Generations of Adam to Noah. The third is Genesis 6-10, which recounts the Generations of Noah and his sons, Sem, Ham and Japheth, and their children which populated the earth.
These three stories follow a simple pattern that is laid out in Genesis 1:1-2, which reads:
[1] In the beginning God created heaven, and earth. [2] And the earth was void and empty, and darkness was upon the face of the deep; and the spirit of God moved over the waters.
After this follows the account of the creation of heaven and earth. But, note well these two verses, because they set the stage for the entire drama of creation and salvation history. In the beginning God created heaven, and earth. The first thing we’re told about God is that He is a creator. And He created everything.
And the earth was void and empty, and darkness was upon the face of the deep. Next, we see God’s creation is in desolation. These words “void and empty” in Hebrew actually paint a picture of a wasteland, like a desert. Remember, this text (Gen, Exo, Lev, Num, Deu) is attributed to Moses, and would have been given to the Israelites during their 40 years in the desert. So, this imagery would have been poignant to them. They had just come from a land of plenty: Egypt, though they had been oppressed there. Now, they were in a wasteland, their future uncertain, desperate.
In these first two verses, we’re not told why the earth was a wasteland, nor why darkness was on the face of the deep (remember, deep here has a two-fold meaning. It refers both to the heavens as well as to the oceans… we see that later when God divides the waters from the waters, those above the firmament of heaven and those below). So, in verse 1, God creates heaven and earth, and in the first part of verse 2, we see that creation in desolation.
And the spirit of God moved over the waters. This imagery of God moving over the waters, or “hovering” is meant to convey the image of God “seeding” the waters, giving life. And that’s it really. That’s the whole story right there. God creates, His creation dies, and He gives it life. Birth, Death, Rebirth. Creation, Sin, Salvation.
So, in the first creation story, we see the creation of the world. That’s it, that’s what we see. The first creation story from Genesis 1:3-2:5 is Genesis 1:1 “expanded” so to speak. The second and third creation stories from Genesis 2:6-10 is Genesis 1:2 “expanded.” These creation stories recount how God’s creation comes to ruin, to destruction: through the wickedness of man, and God’s subsequent “recreation”: He seeds the earth again by preserving his creation on the Ark through the total destruction of the earth by Flood waters which burst forth from “the deep.” And what do we see hovering over these waters of the deep? A dove… the spirit of God, which brings life back to Noah and his family in the form of an olive branch… the typological symbol for peace.
These themes run throughout the rest of Scripture, particularly the theme of salvation arriving by passage through death. The Israelites entered the promised land from the slavery of Egypt only by passing first through the “Red Sea”, and then through 40 years of desert. This is symbolic of death. The waters of Baptism don’t merely symbolize the washing away of our sins, but they symbolize this by imaging death. They are meant to remind of us of the “Baptism of the world” that occurred at the Flood, and also the “Baptism of Israel” at the Red Sea. These remind us that Salvation comes to us through death, particularly the death of our Saviour, Jesus the Christ.
Mary was “overshadowed” by the Holy Spirit, and she was “seeded” with Divine Life. Later, this same spirit, in the form of a dove, overshadows Jesus at His Baptism. And when we are Baptized, this same spirit comes to dwell within us, “seeding” us with His own Divine Life. Do you see how all of these themes permeate the drama of Salvation? So much of these symbols and themes that we are familiar with come to us from the whole creation story, spanning from the creation of all the world, to the salvation of creation through the floodwaters.
Death is the natural consequence and punishment for sin, that is clear from these creation stories, and God preserves us from the death in His own salvific work. That’s the reason the Flood story is there. It completes the “cycle” of Salvation typology that is given to us in the first chapters of Genesis.
After the flood story, this new creation cycles through this story over and over again, until the definitive victory is won in Jesus.