How did more than 80 whales, many of them the size of buses get trapped within yards of each other, in a corner of Chile's Atacama AKA the world's driest desert? That is the question on the mind of every scientist embarking on the investigation of what is being touted as the discovery of the world's biggest and best-preserved graveyard of pre-historic whales, believed to be between 2 million to 7 million years old.