AKTIO SERVICE BUILDING - The Aktio Service Building accommodates the following rooms/areas. Ground Floor consisted of, Low and mid Voltage areas, Diesel Generator Sets area, Transformers area. And  First Floor consisted of, Materials Store, Operation Technicians Supervisor Office, Electricians Office.

PREVEZA SERVICE BUILDING - The Preveza Service Building is built in order to maintain the supervision for the good operation of the tunnel and accommodates the following rooms/areas. Ground Floor, consisted of, Low and mid voltage distribution areas , Diesel Generator Sets area, Transformers area, Emergency exit stairwell (from inside the tunnel to the building’s area). Water tank and firefighting pump station. And the First Floor, consisted of, Control Room, PLC room, Central Air-Conditioning Unit Room, Secretary’s office, Operation & Maintenance Manager Office, Traffic Management Supervisor Office.