It is more than twice the size of Greater London. But the world's largest iceberg, known as A23a, is starting to crumble. Satellite images reveal that an enormous chunk has broken off the megaberg ...

Brits narrowly avoided a clash with the world's largest iceberg when it ran aground on an island earlier this week. The "megaberg", officially designated Iceberg A23A, came to rest near South ...

As the imagery shows, the A-84 iceberg breaks off near the southern end of the George VI Ice Shelf, like a jigsaw piece falling out of place. Shown in fast motion, it tumbles along the Antarctic ...