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Once finished, the Fehmarnbelt Tunnel will set a new record as the world’s longest immersed tunnel.
The contract includes building some 36km of railway, major earthworks, 28 bridges and three viaducts.
Skanska will replace bascule bridges, upgrade tracks and expand capacity to support the MBTA’s commuter rail improvements.
Construction commenced in April 2026, with the road expected to open to traffic after 34 months.