1. The glacier’s rippling mass sprawled from the hills and volcanoes of the Antarctic interior out into the Southern Ocean, covering an area the size of Britain. Won Sang Lee stood on its ice, his tall frame wrapped in a red polar suit, and watched his team at work. Nine scientists, engineers and guides, some of whom had been planning this mission with him for more than half a decade. Now, they were at its final stage: drilling through the melting glacier to reach the vast ocean cavity beneath it.