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The record-breaking tunnel being built from Denmark to Germany

The rail and road link will slash journey times between much of Scandinavia and continental Europe.

Denmark and Germany signed an agreement to build the tunnel back in 2008, but the scheme was delayed by opposition from ferry operators and German conservation groups concerned about the ecological impact. One such environmental group, Nabu (The Nature And Biodiversity Conservation Union), argued that this area of the Baltic is an important habitat for larvae and harbour porpoises, which are sensitive to underwater noise. "We have done a lot of initiatives to make sure that the impact of this project is as small as possible," says Mr Vincentsen, pointing to a 300-hectare wetland nature and recreational area that's planned on reclaimed land, which has been built from the dredged up sand and rock.

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