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Watch: how the world's longest road and rail tunnel will come together

The Fehmarnbelt tunnel, connecting Germany and Denmark, will be the world’s longest immersed tunnel for trains and cars once built – five times longer than the current record holder, the Øresund tunnel.

The 18 km undersea tunnel will cut journey times between Scandinavia and continental Europe to just seven minutes by train or 10 minutes by car, compared to the current 45-minute-plus ferry journey.

The interactive infographic below demonstrates how the tunnel will be built - hit the red play button to see each stage.

Preparatory works are underway already. Denmark has granted final approval, with final German approval still to be granted.

Construction contracts are being managed by Femern A/S, a subsidiary of the Danish state-owned Sund & Belt Holding A/S.

Four main tunnel contracts are in tender with nine prequalified international consortia, with one JV, Femern Link Contractors, including expertise from Vinci Construction Grands Projects and Bam International.