A rare subglacial flood in Greenland has left researchers stunned with its unprecedented scale. The unusual event, which occurred near Harder Glacier in 2014, pushed blocks of ice up to five-story buildings and cleared an area roughly twice the size of Central Park. According to a study published in Nature Geoscience, the flood’s path defied expectations as it bubbled up from beneath the surface instead of flowing down along the base of Greenland’s massive ice sheet. Experts note that this phenomenon is extremely rare due to the unique conditions required for meltwater to force its way upwards. The discovery was made by Mal McMillan and colleagues using satellite imagery, who were searching for signs of lakes beneath the ice when they stumbled upon the anomaly.
Source: https://www.scientificamerican.com/article/hidden-greenland-lake-punches-through-giant-blocks-of-ice-in-extremely