Safety exhaust pipe for propane connecting the "Jet area" with the neutrino area

The horizontal pipe protruding across the car park connects the 'jet area', where the heavy liquid bubble chamber was positioned, with the neutrino area. It served as the safety exhaust pipe for the propane in the chamber in case of accidents and was connected with the tall chimney which would release the propane high in the air. It proved cheaper to make this connection rather than build a separate chimney for the jet area. The formidable concrete supports were no doubt necessary because propane is a heavy liquid!