Let's think of the Ark of the covenant from a scientific view (Oops, just realised that I forgot to call it the Ark of the Covenant. Sorry, I just call it the ark and call the boat ark the Giant Boat that Saved Mankind and Animals and stuff). According to the Bible, any who ventured to close to it or opened the box died. It is possible in my mind, that the death people suffered could have been due to some sort of radiation. Wether it was merely a glowing rock that people found and though "Ooh, purty stone" or a Artifact from some bygone race that used nuclear power, we don't know yet. Who knows, maybe God was the King of Atlantis and possesed the power to Create and Destroy? I'm sounding more like one of those guys in the Tabloids
My opinion on the Great Flood is that it could have been a massive Tsunami of Humanity Destroying Proportions.