Michelle Parks gets ready to make some GPS measurements on Santorini. This survey suggests that the chamber of molten rock beneath Santorini’s volcano expanded 10-20 million cubic meters – up to 15 times the size of London’s Olympic Stadium – between January 2011 and April 2012. The growth of this ‘balloon’ of magma has seen the surface of the island rise eight-14 centimeters during this period. Photo credit: Becca Neely