Antarctica is a continent that is located in the very southern part of the Earth. It is very very cold there and I don’t believe they have permanent residents living actually on this continent. Some people live very close to the border of Antarctica and they consider themselves to be a part of Antarctica. For the most part the only people who live on the mainland of this continent do so temporarily.
So there probably is not one official language that is spoken by the people there because so many different people from different countries visit Antarctica. If there was a language that was spoken on this continent, it would probably be a language from a country that is the closest to Antarctica.