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Contractors have removed the last rock pillar supporting the 60m long, 35m wide roof of Gallery UX15, part of the giant, SFr2.5bn ($1.4bn) particle accelerator being built at the Cern physics research centre in Switzerland. CCC joint venture, bringing together Swiss contractor Zschokke Loscher, German firm Baresel and Austria's Porr-Asdag Tunnelbau, has so far excavated the gallery to a depth of 10m.