Hi the Bible claims to be inspired without error and many of these passages are turned from being presented as history to being presented as a metaphor. This particular account of a global flood is presented throughout the Bible as a historical global event. If the oceans rose over the top of the mountains there is no way it could be taken as a local event as the sea levels would rise equally on both coast of the same oceans. Peter and Jude give insight into what was going on back in the day.
2 Pet For if God did not spare the angels who sinned, but cast them down to hell and delivered them into chains of darkness, to be reserved for judgment; 5 and did not spare the ancient world, but saved Noah, one of eight people, a preacher of righteousness, bringing in the flood on the world of the ungodly; 6 and turning the cities of Sodom and Gomorrah into ashes, condemned them to destruction, making them an example to those who afterward would live ungodly; 7 and delivered righteous Lot, who was oppressed by the filthy conduct of the wicked 8 (for that righteous man, dwelling among them, tormented his righteous soul from day to day by seeing and hearing their lawless deeds)— 9 then the Lord knows how to deliver the godly out of temptations and to reserve the unjust under punishment for the day of judgment,
Note; Peter is speaking historically and brings up fallen angels and the flood. These ideas are related. As Satan certainly is fallen but is yet to be bound. So what angels are bound and is it related to the flood? Jude says this, And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day; Now we have another passage that we will put over the top that is from Genesis that ties the purpose of the flood and the destiny of these angels together.
Now it came to pass, when men began to multiply on the face of the earth, and daughters were born to them, 2 that the sons of God saw the daughters of men, that they were beautiful; and they took wives for themselves of all whom they chose.
3 And the LORD said, “My Spirit shall not strive[fn] with man forever, for he is indeed flesh; yet his days shall be one hundred and twenty years.” 4 There were giants on the earth in those days, and also afterward, when the sons of God came in to the daughters of men and they bore children to them. Those were the mighty men who were of old, men of renown.
Note we see the sons of God used as a term here and they somehow introduced giants into the world both before and after the flood so understanding who the sons of God are is key to understanding the flood and the other passages I have quoted about . In Job we are introduced to this term and Job is thought by many to be the oldest book in the Bible.
6 Now there was a day when the sons of God came to present themselves before the LORD, and Satan[fn] also came among them. 7 And the LORD said to Satan, “From where do you come?”
So Satan answered the LORD and said, “From going to and fro on the earth, and from walking back and forth on it.”
8 Then the LORD said to Satan, “Have you considered My servant Job, that there is none like him on the earth, a blameless and upright man, one who fears God and shuns evil?”
Here is Job Satan is named among the sons of God. Satan is the chief adversary and is still free. But Jude speaks of those angels who did not keep their 1st estate are bound until the great day. The sons of God taking women as wives produced a race of Nephalim. Man is created in Gods image and these beings would have demonic seed not the seed of man. Nimrod and the tower of Babel is another incident that is the seat of all the mystery pagan religions. This rebellion against God is the same thing of unifying the planet set for the end times. The corruption of the race of mankind left few who's genetic material was not effected and also corrupted the peoples with practices that were wholly immoral. The flood was known to God before the creation of man and the universe and it shows the righteous judgement of God and the grace of God at the same time.
If my narrative is true there should be plenty of evidence for a global flood and there is. Look up a guy named Ian Juby and type in flood of Noah and or a guy named LA Marzulli and type in Nephalim and you will see well documented evidence and a major coverup by government officials who have taken the hard evidence that is well documented. Also look up pre flood megalithic architecture. You can see the ruins built by these guys all over the world. Anyways Satan still roams the angles who had relations with man who left their 1st estate are bound until the great day. The book of Enoch goes into great detail and even names the head angels who fell and records the technology they gave to man forbidden knowledge. These days are interesting as God promises to judge the world again and relates it to being just as the days of Noah.