A massive chunk of ice which is around 25 miles long is starting to break away from part of Antarctica.
Scientists reckon the crumbling of the Wilkins Ice Shelf is being caused by global warming and has happened much faster than anyone thought it would.
An ice shelf is a thick, floating platform of ice which sits on the surface of the sea.
It's thought the break won't make much difference to sea levels yet as the ice is still floating on the surface.
The British Antarctic Survey (BAS) said six ice shelves in the same part of the continent had already been lost.
Professor David Vaughan from the BAS said: "Wilkins is the largest ice shelf on the Antarctic Peninsula yet to be threatened.
Ice
"I didn't expect to see things happen this quickly. The ice shelf is hanging by a thread - we'll know in the next few days or weeks what its fate will be."
A peninsula is a large piece of land or ice which sticks out into water, like the sea.
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