What they saw was so strange and so contrary to what they had expected that it took several moments for them even to make sense of the plain evidence of their eyes. Directly below them, only a few meters below the brow of the dune, a flat, featureless slab of dirty-yellow stuff was butted up against the slope. It extended from there all the way out to the North Sea, which was still slamming into it with great waves. But for all their power the waves did not move it. They simply dissolved into it. Even their sound was swallowed up.