The conquest of Gasherbrum IV, one of the most difficult mountains of the Karakorum, took place on August 6, 1958 thanks to the second national expedition of the Italian Alpine Club led by Riccardo Cassin. It cost three months of hard work, risk and adversity: a choral effort that carried Walter Bonatti and Carlo Mauri to the top after untold effort. The technical difficulties unfold around the fifth degree; the altitude, the frost and the storm produce maddening progress. The Gasherbrum IV (7925 meters) today only recorded a handful of ascents.