Color and depth of water
The hypothesis that the intensity of the color of the red and yellow balls seem to lessen as they go deeper into the water is proven to be correct.
There are a lot of factors that determine the visibility of colors in water. The time of the day will determine the angle that sunlight will enter the water surface. Light penetration takes place most during noon when the sunlight is perpendicular to the water surface. The weather will also determine the amount of sunlight and light penetration in the water. A floodlight can be used to augment the lighting required for this science project.
Try to repeat this project using balls of different colors such as violet, brown, white, orange and pink.
Would the results of this experiment differ if it were done in fresh water instead of sea water.
What if it were performed at night, in the absence of any natural sunlight.
Effects of water depth on color visibility - http://www.educatedangler.com/index.php?option=com_content&view=article&id=921
Order of loss of visibility of colors under water with depth - http://www.madsci.org/posts/archives/2000-02/951747486.Ph.r.html
Be extremely careful to ensure the safety of all participants. Life jackets must be worn at all times, and adult involvement is mandatory. The involvement of a qualified and experienced scuba diver is absolutely necessary.