Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service The tunnelling machine used t

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Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service The tunnelling machine used to excavate the tunnel for the Super-Proton-Synchrotron (SPS) accelerator at CERN, the European particle physics laboratory outside Geneva, in 1975. The accelerator, beneath French & Swiss farmland, forms a ring 7 km in circumference. In the 1980s, it was modified to operate as a collider, with protons travelling in one direction, antiprotons in the opposite direction.

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Keywords: 1975, accelerator, boring, centre, cern, constructing, construction, european, geneva, laboratory, machine, nuclear, particle, physics, research, sps, super-proton-synchrotron, switzerland, tunnel, tunnelling, tunnels