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On the 1st of December 1990 British and French teams achieved the first historic breakthrough under the Channel, in the service tunnel, 22.3 km from the UK and 15.6 km from France.
The Channel Tunnel is regarded by many people as one of the most remarkable construction achievements ever; indeed some might say as one of the wonders of the world. However, as much of it is underground, with only the two terminals at either end being obviously connected to the project, it is now difficult to visualise the scale of the project.
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