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Annals of Glaciology
As part of a study of ice dynamics, 25 boreholes were drilled with high-pressure hot water to the base of Haut Glacier d'Arolla, Switzerland. The boreholes were distributed across a half-section of the glacier, with closest spacing towards the glacier margin. The interior structure of the glacier was investigated by lowering a miniature color video camera down 11 boreholes, and the glacier bed was observed in 3 boreholes. The video showed distinct changes in ice conditions with depth in thedoi:10.3189/s0260305500012301 fatcat:bouccy4z25hf7njqqk4l3knmme