The construction of the Channel Tunnel, revealing how the plan was developed whereby two teams - one in France and one in England - working on the construction and meeting in the middle. Competition to reach the halfway point first was fierce, and the margin of error was tiny - if either crew was 2.5 metres out of position the entire project would have had to go back to the drawing board
The Channel Tunnel
It's the most expensive railway tunnel ever built—a product of endless surveying, giant boring machines, and a massive gamble. The Channel Tunnel connecting England and France is now a huge success, but there was a time when it was the tunnel nobody wanted.