Katerini Tunnel T4
Automation in the Service of Safety
Critical infrastructure - highways, tunnels, metro networks, power systems, water treatment, and data centers - has zero tolerance for failure. A tunnel ventilation fault, a traffic management blackout, or an unmonitored fire detection system isn't an inconvenience; it's a safety incident. These projects also operate under some of the strictest technical standards in any industry, with control systems that must run uninterrupted for decades, integrate seamlessly with neighbouring installations, and be auditable by national authorities at any time.
AS HELLAS has been engineering automation for critical infrastructure for over a decade, working as a Siemens partner on some of the most demanding projects in Greece and internationally - including the Egnatia Odos motorway network, the Aegean Motorways (Tempi Valley tunnels), the Katerini Tunnel T4 on the PATHE highway, and the Copenhagen Metro expansion. We design, program, and commission SCADA platforms that unify lighting, ventilation, fire detection, CCTV, and traffic management into a single, fail-safe system - built for environments where downtime is not an option.
Our infrastructure portfolio also extends to mission-critical data center environments, where we must guarantee continuous, fail-safe operation of power, cooling, and environmental controls around the clock. We have delivered automation for a hyperscale data center facility, on behalf of a global technology operator - under the same engineering discipline and redundancy standards we apply to tunnels and transport networks.
Our work spans transportation networks, power generation, wastewater treatment, and data center infrastructure - sectors that drive economic growth and underpin a nation's resilience. We partner directly with prominent Greek and multinational construction and engineering firms, including Siemens, HOCHTIEF, and VINCI.
As these systems increasingly connect to IT networks and the cloud, securing them becomes as critical as automating them. Our AS Secure Ops programme extends this same engineering discipline to OT cybersecurity and NIS2 compliance for critical infrastructure operators.
Highway and tunnel automation, metro and transit systems, power generation control, wastewater treatment, and data center facilities - typically as a specialized automation subcontractor working alongside major construction and engineering firms.
Our systems are designed to meet European tunnel safety standards, covering lighting, ventilation, fire detection, and emergency response scenarios, with full Disaster Recovery System (DRS) functionality.
Yes - for example, the Katerini Tunnel T4 SCADA system was integrated with the already-operating T1–T2–T3 tunnel network without disrupting traffic or existing control center operations.
Typically as a specialized subcontractor to main contractors and joint ventures (e.g. Siemens, HOCHTIEF, VINCI), delivering the automation and SCADA scope within larger infrastructure programmes.
We deliver the SCADA/TMS (Tunnel Management System) automation — integrating lighting, ventilation, traffic monitoring, and safety systems across multi-tunnel networks.
Yes. We have delivered automation for a hyperscale data center facility on behalf of a global technology operator, covering power, cooling, and environmental control systems under strict uptime and redundancy requirements. Specific client details are confidential under NDA.
