Climbing onto the largest vessel the world has ever seen brings you into a realm where everything is on a bewilderingly vast scale and ambition knows no bounds.

Prelude is a staggering 488m long and the best way to grasp what this means is by comparison with something more familiar.

Four football pitches placed end-to-end would not quite match this vessel’s length – and if you could lay the 301m of the Eiffel Tower alongside it, or the 443m of the Empire State

http://www.bbc.com/news/science-environment-30394137