900 meters below the Kazakhstani earth, the freezing winter is over. It is over 30°C in the tunnels in which the roadheaders equipped by TBK are working their way forward bit by bit, day by day. It shakes, it is hot, it is dusty and the atmosphere can also be explosive. Well secured and hidden behind glass several centimeters thick, a very compact S7 panel PLC with fixed onboard peripherals from INSEVIS controls the advance and visualizes the current status for the shift supervisor.