Iceberg the size of Delaware is ‘hanging by a thread’ in Antarctica – and it could lead to a 10cm rise in global sea levels The Larsen C Ice Shelf is primed to lose an area of more than 1,900 square miles , after a rift in the ice shelf grew suddenly by around 11 miles in the second half of December. Just 12 miles of ice now connects the vast iceberg to the rest of the shelf, according to researchers from the Midas project, which has been studying the stability of the Larsen C Ice Shelf for three years.