Because of the location of the car park in the town centre, with a lot of local residents and surrounded by historic buildings, it was decided that installation works should be vibration-free. Using the Cutter Soil Mix technique (CSM), we built a retaining structure for the construction pit, 232 metres long in total and 21 metres deep. In the soft soil mix stretches, steel sheet piling was then inserted as reinforcement, using a non-vibrating method.