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

The sky looks blue for the same reason that the sea looks blue – but the air around you looks clear, you’re not walking around through a blue gas (Smurf farts)