Hello, the story of the Bible says all the highest mountains were covered and the entire earth was underwater. Today the highest mountain is mount Everest at 29,029. If you can believe that water came that high, it would mean that the earth was buried under water for 365 days. If you also believe that the waters drained off the earth within a year, then I guess the story created really touched the hearts of mankind that God is all-powerful.
There is no scientific proof that the earth was ever overwhelmed with water the high and also that heavy. The Bible created a fantasy story to inspire the imagination of humans all over the earth, and I would say yes, every race of people really listened to the Bible stories.