The Perito Moreno glacier in the southern Argentine region of Patagonia has ruptured in a rare winter collapse.
Ruptures are more common in March and April during the southern hemisphere’s summer months.
The glacier, one of the few still growing in the world, cuts Lago Argentino in two.
Water flows beneath the ice when the level on one side of the lake rises higher than the other. The rushing water then erodes the ice sometimes causing it to collapse.
The Perito Moreno glacier, one of the world’s largest, measuring 275 square kilometers and five kilometers wide at it mouth, is located 2,800 kilometers southeast of Buenos Aires.
The glacier started to let water in on Friday, and a tunnel was created through the ice leaving the roof exposed to collapse.
Scientists are divided on the cause, but global warming has not been ruled out.