35 million people lived on Earth when the Bible says the story took place, yet none of them were affected by a supposed flood. Had there been a worldwide flood that reduced the world’s human population to a mere handful, civilizations and their cultural artifacts would have been destroyed.
Alas, the archaeological record shows that various civilizations around the world, and the human race, carried on in a steady fashion before, during, and after the flood supposedly took place with no evidence of such a disaster. Zoogeography shows the same for the animal kingdom. Nowhere in the history of modern man has life ever been bottle-nosed down to just 8 people, nor other animals to just 2 of a kind.