For those who believe that the Bible is God’s Word, the Great Flood of Noah's day is more than a possibility. It is a fact. Jesus said to God: “Your word is truth.” (John 17:17)
Jesus believed that the Flood took place. In his great prophecy about his presence and the end of this system of things, he likened those events to the time of Noah. (Matthew 24:37-39) The apostle Peter also wrote about the floodwaters in Noah’s day: “By those means the world of that time suffered destruction when it was deluged with water.” (2 Peter 3:6)
If Noah was a mythical figure and the Great Flood a fable, the warnings of Peter and Jesus for those living in the last days would be meaningless. It is clear that the deluge of Noah's day was a real event that served as a warning and an example. (2 Peter 3:1-7)
Other evidences of the Deluge can be found to linger in mankind's legends and traditions. Practically all ancient peoples have a legend that their ancestors survived a Great Flood.
It is to be expected that over time the legends have been embellished, but they all include several details indicating a common source narrative. The similarities cannot possibly be coincidental. The combined evidence of these legends corroborates the Bible's ancient testimony that all humans descend from the survivors of a flood that destroyed a world of mankind.
For more, see:
According to the Bible, what was the time span between Adam’s creation to the Flood?
Articles from the WBTS:
Why Did That Ancient World Perish?
In certain respects, the pre-Flood civilization enjoyed advantages that we do ... Many centuries before the Flood, earth's population had grown to such an ...
A Whole World Destroyed!
Practically all ancient peoples have a legend that their ancestors survived a global flood. African Pygmies, European Celts, South American ...
Was the Flood of Noah's Day Really Global?
Some may wonder if the story of the whole earth being covered with water is a myth or at least an exaggeration.