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An iceberg roughly a quarter of the size of Wales is about to break off from Antarctica.
A vast area of Larsen C ice shelf - the most northern major shelf in the Antarctic Peninsula - is said to be "hanging by a thread".
Forecast to be one of the largest separations of its kind, the frozen mass has an area of 5,000 square km (1,930sq miles).
An expanding rift, which has increased in size by 18km (11 miles) over the last few weeks, means the piece is now holding on by a strand of just 20km of ice.
The iceberg will be 350m thick when it caves.