I think the whole early part of the Bible is myth and legend. Just read Genesis with a critical eye and it's full of stuff that doesn't make sense. Read the two different creation accounts. Men living hundreds of years, but not having children until they're several decades old? How many of each kind of bird did Noah take on the ark? 7 or 2, because it depends on which verse you read. Was light never reflected by particles of water so as to form a color spectrum (rainbow) prior to the end of the flood?
How can you take anything like that literally?
OK, maybe there was a flood. But the chances of it being global are slim to none. Flooding happens. It happened around the Mississippi River a few years ago, New Orleans flooded.
So with all the other tall tales in Genesis, do you really think some guy had several years advanced notice to build an ark, then all of the animals flocked together to be saved?
The story as told doesn't make sense. God wants to destroy mankind. He's so ready to wipe out man, yet he decides to wait for an almost 600-year-old man to build a huge boat without the benefit of modern tools. Think of all the time Noah spent. And then think of all the miracles that had to happen to get the animals over to Noah. And if it was a global flood, to keep the fish alive when the water salination changes as fresh and salt water mix. And then to keep the animals from eating each other. To keep them alive on the ark. To get them back to places like Australia. To get them to repopulate, etc. Wouldn't it have been much easier and quicker if God had sent his "angel of death" like he did to the firstborn of the Egyptians? And one of the things God was fed up with was the violence of mankind, yet he decides to kill everything not on the ark?
But who knows? There could have been a guy named Noah. Sure. Why not? If Noah was a Jewish name, somebody with that name maybe existed. Maybe he even lived in a coastal town, owned a boat, and used it to save people during a local flood. But I think he's more of a Paul Bunyan type.