The steel stiffeners were inserted and thus the excavation pit is secured for further underground work. They progress rapidly and the trenches for the collecting pipes of the boreholes for deep probes have already been laid on the bottom of the excavation pit. At the same time, the drainage is running in order to be able to carry out the work in the dry pit. The armouring has also already been delivered so that everything is ready for the next step, the construction of the floor panel.