Modane Underground Laboratory

45°10′43″N 6°41′20″E / 45.1785471°N 6.6890208°E / 45.1785471; 6.6890208

The Modane Underground Laboratory (LSM) (French: Laboratoire Souterrain de Modane; also known as the Fréjus Underground Laboratory) is a subterranean particle physics laboratory located within the Fréjus Road Tunnel near Modane, France. It is jointly operated by the French National Center for Scientific Research and the Atomic Energy and Alternative Energies Commission in partnership with the University of Savoie.