This paper presents a multi-year, multi-method survey of a very large surface melt feature in Northeast Greenland. The feature includes a supraglacial lake that drains into the englacial and subglacial system of the Nioghalvfjerdsfjorden glacier, adding a volume of up to 1.23 * 10^8 m3 of water to the bed of the glacier. The drainage causes uplift of the local area and likely impacts glacier dynamics by lubricating the base. Notably, the authors argue that this feature has only existed since the 1990s, when increased air temperatures led to enhanced surface melt. In this way, the glacier surface has been transformed from lake-free to undergoing frequent, abrupt drainage