Drone-operated instruments like nimble airborne GPR are beginning to provide new access to interesting, hard-to-navigate glaciological features such as the collapse basin investigated here. This paper analyzes drone-based GPR observations of the Rhone Glacier englacial system, including a prominent collapse feature initiated by subaerial and subglacial melt over a period of 20 months. Such collapse features are found in many other glaciated environments, including glaciated volcanoes in Alaska and worldwide, as well as on larger icecaps and ice sheets in Iceland and Greenland, but have historically been difficult to study.