How Deep Is the Ocean?

If the earth was a sphere, you could turn it into a proper sphere. And that would basically be a big pond covering the whole land. They think it'd be like water world, bit like Noah's flood. Matt: Do you want to have a guess how deep do you think it would be overall if all the water was just on the perfectly smooth surface? Chris: I'm going to give you an untangled ding for your excellent headphone advice.