Work on a tunnel and rail system under the Bosporus Strait connecting Europe and Asia in has just started in Istanbul.  The tunnel will be 13.7 kilometres long, (8.5 mile) tunnel and 1,400 meters of the tunnel will be underwater.  The Bosporus Strait, a 32 km waterway connects the Black Sea and the Sea of Marmara, separating European Turkey from Asian Turkey.  It bisects Istanbul as it flows by historic Ottoman castles, mosques and parkland.  The tunnel will become the third link between the city's European and Asian sides.

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