SPT survey, or the South Pole Telescope survey, is a scientific project located at the Amundsen-Scott South Pole Station in Antarctica. The survey is conducted using a specialized telescope that observes the cosmic microwave background radiation, which is the afterglow of the Big Bang. The primary goal of the SPT survey is to study the early universe, galaxy clusters, and dark energy. The research conducted through this survey helps scientists better understand the fundamental properties of the universe and the processes that shaped it.