Würzburg is also expanding underground. The sewage system had to be modernized and adapted to meet increased demands and technical requirements. The difference in height of over ten meters on the section "Rottendorferstraße" was a worry for city planners. Three horizontal and two vertical curves had to be overcome and, once, even simultaneous horizontal and vertical changes in direction had to be made.
The gyroscopic Universal Navigation System (U.N.S.) developed by Herrenknecht engineers kept an extended AVN1200TC exactly on course over the 436-meter-long drive. Thus, in mid June 2005, the machine fitted with gyroscompass and hydrostatic level reached the target shaft with precision and without having come out of the curve for even a second.