In Istanbul, commuter trains run 60 meters beneath the sea through the deepest immersed tunnel ever sunk: the first rail link joining Europe and Asia under the Bosphorus

Discover the Marmaray Tunnel in Istanbul, the world's first and deepest immersed train tunnel under the Bosphorus, revolutionizing commutes between Europe and Asia. Learn about its engineering marvel, historical significance, and impact on urban mobility.

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