A RECENT voyage round Africa recalled my attention to interesting problems connected with the colour of the sea. They are not always easy of solution in consequence of the circumstance that there ...

THE view has been expressed that “the much-admired dark blue of the deep sea has nothing to do with the colour of water, but is simply the blue of the sky seen by reflection” (Rayleigh's ...

This is because for the water to reflect blue light, it has to be a large body of water, at least 1 metre in depth. The sea also reflects the colour of the sky: the surface of the sea acts like ...

Image: The team filmed from 200m under the sea We levelled out at 200m, well into the twilight zone. There was just a dim light from above illuminating an alien world.