The Sanford Underground Research Facility (SURF) is located in Lead, South Dakota, and operates deep underground in the former Homestake Gold Mine. It provides a unique environment for scientific research, shielding experiments from cosmic rays and other surface-level interference. SURF hosts a variety of experiments in fields such as particle physics, geoscience, and biology. Researchers study fundamental questions about the universe, including the nature of dark matter and neutrinos, making it a key site for advancing our understanding of science.