Turkey on 6 August 2013 successfully completed a trial run of a rail tunnel under the Bosphorus Strait connecting Istanbul's European and Asian sides.The 13.6 km (8.5 mile) tunnel, including a 1.4 km immersed tube tunnel is the deepest of its kind in the world at 56 metres. It passes under Turkey's Bosphorus Strait, the busy shipping channel linking the Marmara Sea to the Black Sea.
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