Part of Antarctica’s Larsen C ice shelf will soon break away, spawning one of the largest icebergs on record. The crack in the ice shelf, which led to the birth of the iceberg, was monitored closely using radar images from the Copernicus Sentinel-1 satellites. ESA’s CryoSat mission has been used to measure the thickness of the eventual berg: on average, it is 190 m thick, but at its thickest point it has a keel 210 m below the ocean surface, and it contains about 1155 cubic km of ice.