the Great Flood is not just a metaphor. Could have really happened. A comet or asteroid of prodigious size smacking down in mid-ocean would have caused tsunami and earthquake of earth-shaking proportions. Biblical even!!
It is reputed from Jewish apocrypha that the ark was lit on the inside by a "pearl" mounted on the roof. Actually a specially faceted crystal that refracted light to the inside of the ship. Modern technology did not "invent" such a device until the 19th century. Spooky, isn't it?