Marmaray Project with Marubeni Corporation

The second major project is the Marmaray Tube Crossing Project. Marmaray is the first tunnel under the Bosporus in Turkey. During the project, 5100 tons of sodium silicate solution was supplied to the Japanese company Marubeni Corporation between 2005-2011. With our success in this project, we have worked together with Marubeni Corporation on the Sofia Metro Extension Project.