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A vast undersea tunnel is being built that will change the road and rail map of Europe

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The Fehmarnbelt tunnel between Denmark and Germany will be the world’s longest road and rail tunnel.

At 18 kilometers ( 11.2 miles ) it will carry two -lane road highways under the water in both directions.

The tunnel is made using prefabricated concrete sections which are dropped into a trench dug on the seafloor, linked together, and then buried.

The 7.4 billion-euro ( $7.7 billion ) project is a huge undertaking, in every sense.

Construction of two tunnel portals at Rødbyhavn and Puttgarden is progressing.

Giant rubber gaskets and secondary seals engineered to last 120 years ensure the tunnel is watertight.

Concerns have been raised over its environmental impact on marine and coastal habitats.

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