Denmark and Germany will be linked by an 18-kilometer-long underwater tunnel that will be the longest combined rail and road tunnel in the world when completed in 2029. The €10 billion project will have two double-lane motorways and two electrified rail tracks. It will take seven minutes by train and 10 minutes by car to travel through it, avoiding a 160 kilometer detour across the Danish mainland and cutting rail travel times from Hamburg to Copenhagen from around five hours to less than three. The road link will replace a busy ferry service that carries millions of passengers a year. Denmark plans to build high-speed electric rail lines to and from the tunnel.

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