Before 1878, in a period with increased rate of ablation, a supraglacial lake formed in the centre of the glacier, this lake subsequently became covered by ice and snow. The collapse of the glacier tongue in 1892 finally released the accumulated water, a large cavity 40m in diameter and 20m high containing estimated 20.000 cubic meters water at the glacier terminus remained as testimony. From this lower cavity, an 85m long intraglacial conduit led to the upper cavity (the former lake) with an additional volume of 80.000 cubic meters. [History of Geology: Outburst flood from Glacier de Tete Rousse: A...