The Eurasia Tunnel is a road tunnel in Istanbul, Turkey, crossing the Bosphorus strait undersea. The tunnel was officially opened on 20 December 2016. The 5.4 km (3.4 mi) double-deck tunnel connects Kazlıçeşme on the European and Göztepe on the Asian part of Istanbul on a 14.6 km route. It crosses the Bosphorus beneath the seabed. It is at about 1 km south of the undersea railway tunnel Marmaray, which was opened on 29 October 2013. With this new route, the journey time between Kazlıçesme and Göztepe is shortened from 100 minutes to 15 minutes.