Brazo Rico's water levels reach nearly 100 feet higher than the waters of Lake Argentino every four to five years. When this happens, the glacier cannot withstand the stress and the result is a rupture of the glacier. The last time this occurred was in March 2012. The collapse that Grosso witnessed was an after effect of the 2012 collapse, which hollowed out a large hole in the glacier. This collapse happened when a leftover ice bridge melted.
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