For the exploration of the Greenlandic massif, the autochenille was the only alternative to the traditional dog sled until recently. The plane could not land on the frozen ground, and flying over the icy solitudes allowed only very superficial exploration. The helicopter changed all that thanks to its qualities of flexibility, stability in flight and, above all, resistance to the cold, which made it the indispensable complement to the plane. Brought in by the latter, the helicopter, assembled in a few hours, carries out missions that would have required several weeks in an autochenille: locating passages, choosing the location of camps, transporting personnel and various links. Only its limited flight autonomy requires frequent refuelling, which is carried out by the aircraft at agreed points.