Soletanche Bachy developed the Cit’Easy. A special Hydrofraise machine, the Hydrofraise XS2, was developed for urban diaphragm walls, which as a rule have moderate thicknesses and depths. Requiring less space and consuming less energy than the conventional Hydrofraise, the XS2 nevertheless offers equivalent or superior drilling efficiency. A new-generation mud plant is used in conjunction with this machine. It has three shipping container-sized modules that can be stacked and highly simplified connections between the elements. The plant has a small footprint and takes very little time to set up. The Cit’Easy process is not limited to a single high-performance machine set. New methods and a new production organisation have been designed to accommodate further tool development.