“Turkey” is the name of the country that has completed its trial run of the World’s deepest rail tunnel on 6th August 2013. The tunnel will connect Istanbul’s European and Asian sides. It is the first of several planned mega projects in the country’s largest city to see the light of day. The tunnel is 13.6 km (8.5 mile) long including a 1.4 km immersed tube tunnel is the deepest of its kind in the world at 56 meters.