Murky Water
Sometimes directors have to make decisions based on what looks better, and sacrifice some of the credibility for it. When we watched Titanic, it never occurred to us that even the water doesn’t look quite as it should have. In reality, the water would be much darker, murky, and filled with sea creatures.
That would’ve been much more accurate to real life, but it would’ve been a nightmare to film, not to mention a cinematography nightmare.