Due to various and increasing use of tunnels in urban structures as surface drainage systems, water and sewage transmission networks, subway and transportation networks, dam & road projects including primary, secondary and local roads, their construction is becoming more popular all around the world. Therefore, their design are of paramount importance among structural engineers.

GNEC group, by using the most modern methods and applied hardware and software, has carried out geotechnical, geological and hydraulic study, design and construction of tunnels, culverts and underground long structures.