The 2012 List, prepared every year by considering the companies’ volume of business realised abroad, was published by International construction sector magazine “Engineering News Record” (ENR). According to the survey carried out to determine the world’s largest top 225 contracting companies, the number of Turkish companies on the list has increased from 31 to 33.

Marmaray project continues at full speed. The most intriguing and interesting part of the project which will connect Gebze and Halkali with a undersea commuter train line is definitely the sunken tube tunnel constructed under the Strait. The construction of the world’s deepest tube tunnel built 60 meters below the sea level has been completed