The calving event is expected to take place on the Larsen D ice shelf within the next month.
The latest findings are significant when it comes to our understanding of how glaciers will be impacted by man-made global warming.
A large iceberg has broken away from Antarctica's Amery ice shelf, in a natural process scientists call a "calving" event.
They are some of the last unexplored parts on Earth; the largest is more than 200 miles long.
Understanding ice shelves is key to projecting sea level rise.
The soon-to-be iceberg is moving faster than ever. It's a matter of "hours, days or weeks."
When the fissure eventually splits off it will create one of the biggest icebergs ever recorded.