OK, let's get some of the things cleared off:
1.)Well, this is the truth about that. It is true that the player's can hold their breath for a long time, but what really helps them is the pyreflies in the water. As you may know, pyreflies go well with water.How do they breath under water? Can some one please just explain that part to me?
2.)
actually, they spend a lot of time than you think. The director mentions this in the interview with him.Therefore they didn't spend a whole lot of time on it as they wanted to make the actual game itself better.