Some Bible commentators believe there were two global floods. One at the beginning of Earth's history (Genesis 1:2) and one during Noah's time (Genesis 6-9). But is this totally true or was there only one global flood during Noah's time.
Lets look what the Scripture says in 2 Peter 3:5-6. "For this they willing are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water: Whereby the world that then was, being overflowed with water perished:"
In this passage of Scripture we can plainly see that the Earth is covered with water and is in a state of destruction. In the beginning the Earth was also covered with water, when God started His creative acts on it from day one to day six of Creation week (Genesis 1:1-31).
Bible commentators believe 2 Peter 3:5-6 is talking about a flood before Noah's flood. But there is a passage of Scripture in 2 Peter 2:5 that tells us what flood Peter was talking about in 2 Peter 3:5-6. "And spared not the old world, but saved Noah the eighth person, a preacher of righteousness, bringing in the flood upon the world of the ungodly." Interesting piece of evidence can be found in 2 Peter 3:6 to reinforce the idea that the phrase "the world that then was" is referring to the world that was destroyed in Noah's time. Notice how the world of Noah is referred to as "the old world" in 2 Peter 2:5. Clearly, "the old world" in 2 Peter 2:5 and "the world that then was" in 2 Peter 3:6 are the same world.
The worldwide Flood of Noah's day (Genesis 6-9) is the one Peter is talking about in Second Peter. There was only one global Flood that Jesus Himself talks about in Matthew 24:37-39 and Luke 17:26-27. He compares Noah's Flood with a future time when He will be back to the Earth.
Why is there so much confusion about two global floods in the Book of Genesis. Our Lord Jesus Christ is not the Author of confusion (I Corinthians 14:33). Surely He would of mentioned that there was two floods in the Book of Genesis when He walked the earth. No clear biblical passage supports a worldwide destructive flood in Genesis 1:2. "...let God be true, but every man a liar..." (Romans 3:4).