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Please help expand and improve this article or section by translating from the French Wikipedia into English. (December 2008)
A section of the 27 km (17 mi) tunnel excavated by CERN between 1983 and 1988 passes under the town. Originally excavated for the LEPcollider, the tunnel now houses the Large Hadron Collider that started operating in 2008. The major visible presence of the LHC tunnel in the area are some surface buildings and some large helium gas tanks further North in Cessy. There are also a number of smaller tunnel Access Points, including one on the border of Ornex and Ferney-Voltaire. Liquid helium is used to cool the LHC's superconductingmagnets.
Ornex is relatively well served by restaurants, with approximately one restaurant for every 450 residents.
Between 1975 and 1999, the population of Ornex increased by 1,621. The population of Ornex is extremely diverse, representing many nationalities and several languages.