March 4, 2021 A giant iceberg, about twice the size of Chicago, broke off from Antartica’s Brunt Ice Shelf in late February 2021. Satellite images show the iceberg breaking free and moving away rapidly from the floating ice shelf. Image via ESA. A giant iceberg, about twice the size of Chicago, broke off from the northern section of Antarctica’s Brunt Ice Shelf last Friday (February 26, 2021). The new berg – informally dubbed ‘A-74’ – spans about 490 square miles (1,270 square km). That’s a large iceberg, but Antarctica is known for churning out some enormous bergs. For example, iceberg A-68 was almost five times bigger when it calved from the Larsen C Ice Shelf in 2017.