Iceberg A68 in South Atlantic ocean keeps getting smaller and smaller as another portion detaches this week This new ice portion, christened A68g, measures 33 miles on its longest axis and 11.5 miles on its widest axis A68 broke away in 2017 due to iceberg calving – the breaking away of masses of ice from the edge of a glacier It was originally more than three-and-a-half times the area covered by Greater London but it's breaking up fast