EDELWEISS (Expérience pour DEtecter Les Wimps En Site Souterrain) is a dark matter search experiment located in the Modane Underground Laboratory.
The experiment will be built in the Modane Underground Laboratory, in the Fréjus road tunnel between France and Italy, the deepest underground laboratory in Europe.
He was noticed for outstanding technical skills, so when king Vittorio Emanuele II decided to build the Mont Cenis Tunnel between Bardonecchia and Modane in 1857, Sommeiller was appointed head of design and construction.
Reconnaissance work began on the French side in 2002 with the excavation of access points at Modane, then Saint Martin la Porte (2003) and La Praz (2005).
The easiest route for the summit starts from col du Fréjus, which connects Modane and Bardonecchia, then passes by punta del Fréjus and follows the south-western ridge of the mountain.
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Administratively the mountain is divided between the Italian comune of Bardonecchia (southern face) and the French communes of Modane (north-western face) and Avrieux (north-eastern face).
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The French name comes from the "Grand Vallon", a secondary valley which starts from the mountain and goes northwards towards Charmaix and Modane.
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The A43 autoroute and a railway line enter at the western end from the Isère valley, and leave at Modane using the Fréjus Road and Rail Tunnels respectively which both emerge at Bardonecchia in Italy.