Marmaray is a suburban line improvement project consisting of three sections, the foundations of which were laid in 2004 and under construction, which will connect the European and Asian sides under the Bosphorus. Marmaray is a Eurotunnel-like railway project in the English Channel. Halkalı and Gebze. There are also connections to the Istanbul metro. 1 will shorten the transportation time of millions of people and save energy and time. Bosphorus Bridge and FSM Bridge will also reduce the workload.