43,26 km 2 x 2 roads in earthquake zones of Sakarya - Kocaeli - Düzce. Soil Works, Engineering Structures, Sea
The total length of 15,4 km, 3.34 km two story undersea 2 x 2 highway tunnel with a diameter of 13.70m (TBM). Deep elevation of the road is -106m below sea level. It is one of the most prestigious and unique transportation construction in Turkey’s history. It connects the Asian side of Istanbul to the European side allowing drop in traffic congestions for the Bosphorus bridge.