First contracts for Three-Level Big Istanbul Tunnel put up for auction

The first preparation and engineering projects  for the construction of the Three-Level Big Istanbul Tunnel are set to be put out to  auction today by the infrastructural investments directorate of Turkey’s Transport, Maritime Affairs and Communication Ministry. 
The  project will be the first three-level tunnel in the world and will consist of both a metro line and dual motorway designed to provide faster and cheaper transportation between the two sides of Istanbul. On completion, it will  integrate nine different urban train systems with a fast metro track, which between them carry around  6.5 million passengers a day.

Source: dailysabah