The first inhabitants to the Northern Islands (islands way north of the Antarctic Peninsula) may have arrived in the northern tip of the South Shetland Royal National Park, or even Ridley Island. First inhabitants must have came from somewhere in the Tierra del Fuego, but Ushuaia, Puerto Williams, or Cape Horn, since they have a town there now. Other options are Cape Town, Agulhas area, Hobart or anywhere in Tasmania, Melbourne or anywhere in Victoria, and anywhere in New Zealand's South Island.
As overpopulation takes toll, creating situations and life even worse in the known inhabited 5 continents (North America, South America, Europe, Asia, Australasia and Oceania), people began to migrate to what was then cold places like Antarctica, Arctic islands, etc. One of these only destinations are Antarctica, and maybe, the people living closest to Antarctica got an option to go there. People would leave their homes and leave to the port, where they would do anything but go away from the hellish world.
People would overcrowd ships, and all ships are used in wherever they are. In the end, no one was left in the town or the port. No ships left docked in the port either. Places like Hobart, Melbourne, and especially Ushuaia are the ones that are the emptiest. As they sail their way to Antarctica, its no longer freezing anymore. Back then, travelling to any Antarctic or sub-Antarctic place, was very treacherous, and is almost impossible. Now, it is smooth, clear-skied, and is quite easy to go to, except the time to travel, which can take up to a week from places like Cape Horn, and even a month from places like Melbourne.
As inhabitants arrive at the closest place they could be which can be varied, they would walk to a flat surface, closest to fresh water, and ones closest to the sea or any body of water as well. They would then start building tent houses from whatever they take, and soon, they would mine rocks, though this is just temporary.
As the boats refill themselves with leftover fuel brought back from land, they would then travel to what was then known to the promised land; King George Island. Most scientists stationed in Antarctic and sub-Antarctic areas would be stationed here, and there are actually lots compared to other islands and the mainland.
With Chilean, Chinese, Russian, Korean, Argentine, Polish, Peruvian, and Brazilian scientists, stationed in over 10 different and separate scientific bases at the island, all of the "refugees" that is a to-be-Antarctic inhabitants, gathering in many different spots of the island, mostly being in a scientific base, all of the refugees but effort on building shelter with everything they brought back at their old homes, as the scientists stationed at that specific base also put an effort, as they try to give everything they have to build the refugees a place to stay.
After the development, local governments in each specific area began to spring up, as they began to sort things out in the areas democratically. The first census also took place about 4 years after building the shelters "project" was complete, as the region of Fildes Peninsula, home to half of all the bases in the islands itself, already has over 25,000 inhabitants, and only from 400 scientists in summer, and 200 scientists in winter.
Also, Ridley Island then became preserved as a protected historical site, as the remnants of the foundations of the temporary houses was placed there, with things that were broken, thrown out, and abandoned in the island.