eli5: Why is water clear in small amount but blue in large amount like an ocean?

Question

I thought it might be the reflection from the sky but if that was the case, why does the ocean appears more blue the deeper you go?

In: 2918

Answer 1

This is video of a color chart being submerged up to 60′ in water. This shows how the other colors (red & green) are being absorbed by the thicker layers of water above the chart.

[https://www.youtube.com/watch?v=mwRai7Y2RiQ](https://www.youtube.com/watch?v=mwRai7Y2RiQ)