Fig. 4: Conceptual model of the Harder subglacial lake drainage and surface outburst.
From: Outburst of a subglacial flood from the surface of the Greenland Ice Sheet

The texts associated with blue arrows indicate tentative hypotheses. Note that the graphic is not to scale and the precise angle of flood propagation upwards to the surface remains unknown. Landsat-8 surface imagery data from https://earthexplorer.usgs.gov.