An Underground Research Laboratory (URL) is a facility located deep underground, often in mines or caverns, designed for scientific research. These laboratories provide a controlled environment that minimizes interference from cosmic rays and surface-level noise, making them ideal for experiments in fields like particle physics, geology, and environmental science. One notable example is the SNOLAB, located in Canada, which focuses on neutrino and dark matter research. URLs are also used for studying microbial life in extreme conditions, contributing to our understanding of life on Earth and potentially other planets.