The Argentine exploration to the continent started early in the 20th century. José María Sobral was the first Argentine to set foot on Antarctica in 1901. He spent 2 seasons with the Swedish Antarctic Expedition of Doctor Otto Nordenskiöld. In 1904, the Orcadas Base was fully working. Years later other bases were made. The first Argentine expedition to reach the South Pole was the 1965 Operación 90.