On 14 June 1962 an expedition led by then First Lieutenant Gustavo Adolfo Giró Tapper left Esperanza looking for a passage that would link the village with San Martín. Using snowcats and sleigh dogs they explored Duse Bay, Prince Gustav Channel, Cape Longing, Foca Nunataks, Ameghino Peninsula, Jason Island, Cape Robinson and Carreta Bay, where they had to leave the snow cats and continue with sleds to cross the cordillera. After reaching San Martín, they traveled back to Esperanza, where they arrived on 25 August. During the trip the party overcame numerous obstacles and withstood temperatures below and katabatic winds of . This feat is considered even now as the most important ever made in the area.