A vast undersea tunnel is being built that will change the road and rail map of Europe | CNN
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On the shores of the Baltic Sea, in the south of Denmark, a massive engineering marvel is taking shape — piece by giant concrete piece — that, when finished, will be the longest of its kind in the world.

Linking Denmark and Germany, the Fehmarnbelt will carry two-lane road highways under the water in both directions, plus two electrified rail lines — a multiple tube thoroughfare that will plunge beneath the waves of one of the world’s busiest shipping lanes.

At 18 kilometers (11.2 miles), it’s nowhere near as long as the 50-kilometer (31-mile) Channel Tunnel, but in many other ways it’s bigger. The project will, in fact, be the world’s longest road and rail tunnel, and the world’s longest immersed tunnel.