I understand that showing a murky-brown sediment-filled ocean below the Ark would not be especially pleasing to the eye. It also raises even more questions such as how would filter feeding whales survive in muddy water? However, around the corner they weren’t afraid to get real about the devastation of the Flood by showing a heathen teenager girl who missed the boat being eaten by a shark. I will grant that the latter is artistic license but it doesn’t violate any of the young-earth creationist predictions of what could have happened at the onset of the Flood. Showing clear blue seas, on the other hand, is a depiction of a history they believe to be false.