It occurred in August 2005 but was only recently detected on satellite images.
"The Arctic is all frozen up for the winter and it's stuck in the sea ice about 50km (30 miles) off the coast," said Luke Copland, an assistant professor at the University of Ottawa.
"The risk is that next summer, as that sea ice melts, this large ice island can then move itself around off the coast and one potential path for it is to make its way westward toward the Beaufort Sea where there is lots of oil and gas exploration, oil rigs and shipping."
"The risk is that next summer, as that sea ice melts, this large ice island can then move itself around off the coast and one potential path for it is to make its way westward toward the Beaufort Sea where there is lots of oil and gas exploration, oil rigs and shipping."
The ice break was initially undetected due to the remoteness of the northern coast of Ellesmere island, which is about 800km (500 miles) from the North Pole.
Satellite images showed the 15km (9mile) crack, then the ice floating about 1km (0.6 miles) from the coast within about an hour, said Mr Copland, a specialist in glaciers and ice masses.
You could stand at one edge and not see the other side, and for something that large to move that quickly is quite amazing," he said.
Mr Copland said a combination of low accumulations of sea ice around the edges of the ice mass, as well as the Arctic's warmest temperatures on record, contributed to the break.
The region was 3C (5.4F) above average in the summer of 2005, he said.
Mr Copland said a combination of low accumulations of sea ice around the edges of the ice mass, as well as the Arctic's warmest temperatures on record, contributed to the break.
The region was 3C (5.4F) above average in the summer of 2005, he said.
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