“Turkey has successfully completed a trial run of a rail tunnel connecting Istanbul’s European and Asian sides, the first of several planned mega-projects in the country’s largest city. The 13.6km (8.5-mile) tunnel, including a 1.4km immersed tube – the deepest of its kind in the world at 56 metres – passes under the Bosphorus strait, the busy shipping channel linking the Marmara Sea to the Black Sea. A Japanese-Turkish consortium began constructing the tunnel in 2004, with funding coming from the Japan Bank for International Co-operation and the European Investment Bank.”

http://www.theguardian.com/world/2013/aug/05/turkish-rail-tunnel-bosphorus-erdogan

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