This is not history. The flood account in the Bible is actually a Hebrew version of an older tale from Babylonian mythology. In the epic of Gilgamesh, Utnapishtim is the righteous man saved from the flood. In the Bible, the story is adapted to represent Hebrew values. In 1929, Sir Leonard Wooley found evidence of a flood near Ur.
Evidence there indicates a local flood caused by activity in the Persian Gulf.
This flood destroyed whatever civilization had existed there. The flood was probably a local occurrence since the history of Egypt provides an unbroken record throughout this period. We have to remember that the known world in ancient times consisted of all of the lands around the Mediterranean and the Middle East. A massive deluge seemed to have worldwide implications even though it was only local devastation. There are inconsistencies in the Biblical record.