The first error is the view passed down from a children's level storytelling framework. Babylon has a similar story. The dimensions are the same as our modern battleships. The Flood was regional not world wide aa we now know what world wide actually is... Their world flooded,the whole Earth as they knew it. Recent geological studies are looking at a great sea caused by melting Ice Age glaciers, held back by an earthen dam that eventually collapsed under the building pressure... and I surmise the whole flood happened during a monsoon season. All the animals wer "locals," too - no elephants, for example. We think the ancients were stupid, ignorant, unskilled, incapable, etc. Have you checked out the Pyramids or other ancient archaeological structures? The so-called challenges you present ae not challenging to either God nor Man. Just sayin'.