The magnet core of the CMS (Compact Muon Solenoid), a 1,920 tons element, reaches the bottom of the experimental cavern after being lowered 100 meters at the European Organization for Nuclear Research CERN (Centre Europeen de Recherche Nucleaire) in the French village of Cessy, near Geneva February 28, 2007. REUTERS/Ruben Sprich (FRANCE)