Argentine Antarctica observatory, where he also worked a post office was installed. Civil (employee of the Argentine company official post and telegraph) Hugo Alberto Acuna accounted hoist for the first time in an official way the flag of Argentina on the Argentine Antarctic sector, on 22 February 1904. Such an observatory became the Orcadas Base the oldest existing today across the Antarctic territory permanent human settlement. The Argentine corvette ARA Uruguay returned to Antarctica in 1905 (sailed from the port of Buenos Aires on 10 December 1904) to relieve staffing of the South Orkney and refer to Deception Island and Wiencke Island
Brazilian Antarctica May 1975, making the first official mention of the Frontage Theory, which states (simplified) that sovereignty over each point in Antarctica properly belongs to the first country whose non-Antarctic territory one would reach when travelling north in a straight line from such a point. The Frontage Theory ("Teoria da Defrontação") was proposed by Brazilian geopolitical scholar Therezinha de Castro and published in her book "Antártica: Teoria da Defrontação". Outside the zone of interest, Brazil maintains a permanent staffed research facility, the Comandante Ferraz Brazilian Antarctic Base (UN/LOCODE: AQ-CFZ), located in Admiralty Bay, King George Island, near the tip of the