World's largest iceberg ends its ocean odyssey: Huge TRILLION tonne megaberg that was once more than twice the size of Greater London breaks into chunks just months shy of its 40th birthday

The world's largest iceberg, B-15, which was once more than twice the size of Greater London, has broken into chunks after a 40-year journey. The trillion-tonne iceberg, part of the Antarctic, has ended its ocean odyssey.