The Ministry of Transport and Infrastructure of the Republic of Turkey has inaugurated the commissioning of the main phase of the Marmaray project, an initiative to connect the Asia-Europe corridor. The project has been carried out by the joint venture integrated by OHL (70%) and Siemens (30%) and represents an important construction and communication milestone at the global level.

OHL, as main contractor, has undertaken the design, the complete replacement of the two existing roads and their replacement in three new 62 km roads of the 76 km of the project, the renovation and construction of 38 stations, the construction of 130 structures, two operation and control centers, garages and workshops, renovation of all electromechanical systems (power supply, catenary, signaling, telecommunications and ticketing systems) along the 76 km of the project.