Antarctic iceberg the size of London An iceberg the size of London has calved off the Antarctic continent after cracks extended across the Brunt Ice Shelf Jan 20 Brunt Ice Shelf Flowing at 2km/year Chasm-1 dormant until 2012 Comparison: London 1569km2 Jan 24 Iceberg 1550km2 150m thick 232bn tonnes Halley VI Research Station Chasm-1 extends across ice sheet 25 miles 40km 2017, Larsen C Ice Shelf: Iceberg A-68, 5800km2 Weddell Sea 2021, Ronne Ice Shelf: Iceberg A-76, 4320km2 Amundsen Sea “Doomsday” Glacier: Scientists fear 192,000km2 Thwaites Glacier could collapse, triggering 3m sea level rise 2021, Brunt Ice Shelf: A-74, 1270km2 South Pole Transantarctic Mountains 2000, Ross Ice Shelf: B15, 11,000km2 Ross Sea 1986, Filchner Ice Shelf: A-23A, 4000km2 Indian Ocean ANTARCTICA Antarctic Circle 1956, Southern Ocean: Largest iceberg ever witnessed, estimate 31,000km2 Source: BAS Pictures: Landsat © GRAPHIC NEWS