A chunk of ice bigger than the US state of Delaware is hanging by a thread from the West Antarctic ice shelf, satellite images revealed Wednesday.
When it finally calves from the Larsen C ice shelf, one of the biggest icebergs in recorded history will be set adrift — some 6,600 square kilometers (2,550 square miles) in total, according to the European Space Agency (ESA).
The iceberg's depth below sea level could be as much as 210 meters (almost 700 feet), or about 60 stories, it said.
"The crack in the ice is now around 200 kilometers (125 miles) long, leaving just five kilometers between the end of the fissure and the ocean," the ESA said in a statement.
"Icebergs calve from Antarctica all the time, but because this one is particularly large its path across the ocean needs to be monitored as it could pose a hazard to maritime traffic."
Scientists tracking the berg's progression expect it to break of within months.
The Larsen C shelf will lose more than 10 percent of its total surface area.
The massive ice cube will float in water and by itself will not add to sea levels when it melts.
The real danger is from inland glaciers.