The 55-km Hong Kong-Zhuhai-Macao Bridge (HZMB), comprising the 12km Hong Kong Link Road, 29.6km Main Bridge and 13.4km Zhuhai Link Road, is the longest bridge-cum-tunnel sea crossing in the world. The Hong Kong Link Road (HKLR), a dual 3-lane carriageway, connecting the Main Bridge and the Hong Kong Port. It comprises land and marine viaducts about 9.4km in length, a 1km Scenic Hill tunnel and a 1.6km road section. ITMation responsible to design, build and supply the CMCS for the Scenic Hill tunnel and tunnel buildings. The CMCS controls and monitors various sub-systems including Tunnel Ventilation, Tunnel Lighting, Fire Service, HVAC, Plumbing and Drainage, as well as the HV and LV Power Supply System. The system also provides operators with dynamic graphic displays of the plant equipment as well as system and equipment alarms, trends and maintenance reports, etc. The system is based on the SIEMENS SIMATIC Hardware redundant PLC and SCADA WinCC in redundant server-client system.