This One is for You John

My brother-in-law, John, is a geologist. The sort of guy that likes walking around with a wee hammer bashing things. Well this will certainly appeal to him. What a great idea - a subsurface picutre of your world. What a shame it doesn't extend offshore - what's all that about then? Or is it just the mash-up that's been presented by the BBC? Well, if the link worked I'd be able to answer my own question but hey ho, tomorrow's another day...