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Scientists from all over the world come to Antarctica. Many are based at research stations like the Amundsen-Scott facility and collect data from great distances.
Watch this video, where scientists from the University of Washington describe their work capturing data on rising sea levels. They use radar technology to study the subglacial and englacial (inside a glacier) conditions of Antarctica's rapidly changing ice sheets.
Source: University of Washington, https://www.youtube.com/watch?v=se-BRvZuu7k This work is licensed under a Creative Commons Attribution 3.0 License.