Cross-section of a sewer

Between 2017 and 2019, the final and most comprehensive stage of rescue archaeological research took place, namely in the area of ​​the garden near the southern facade of Müller House on plot no. 558. During the unearthing of the main fortification wall, in the place of the original moat and, at the same time, on its bottom, an arched channel was found, which was connected to a wooden duct at the base of the original bottom. The duct fulfilled the connecting and drainage function of the original moat of the city and, later, the castle fortification.