Of course there was a massive extinction event and some very Earth changing events as the world in Noah's day was very different. It hadn't even rained ever before the flood. During this time there must of been some seismic activity as water rose up from beneath the crust (which is also scientifically proven)
It is also debated by what the word world meant because the ancients often spoke of localized or regional events in hyperbolic terms. One does not need to look too far for examples. Consider the following from the Old and New Testaments:
- Genesis 41:57 – “And all the countries came to Egypt to buy grain from Joseph, because the famine was severe in all the world.”
- 1 Kings 10:24 – “The whole world sought audience with Solomon to hear the wisdom God had put in his heart.”
- Luke 2:1 – “In those days Caesar Augustus issued a decree that a census should be taken of the entire world.”
- John 12:19 – “So the pharisees said to one another, ‘See, this is getting us nowhere. Look how the whole world has gone after him!”
- Acts 2:5 – “Now there were staying in Jerusalem God-fearing Jews from every nation under heaven.”
- Romans 1:8 – “First, I thank my God through Jesus Christ for all of you, because your faith is being reported all over the world.”
- Colossians 1:6 – “All over the world this gospel is beairng fruit and growing, just as it has been doing among you since the day you heard it and understood God’s grace in all its truth.”
The ancient Hebrews did not think of “the world” as being a spherical globe, as one would today. Rather, to say that God had “flooded the world” would be simply to say that God had “flooded the known world” or “the land”. Indeed, 2 Peter 3:6 reports that, “By these waters also the world
of that time was deluged and destroyed.
https://www.smithsonianmag.com/science-nature/evidence-for-a-flood-102813115