Incredible £4.65bn underwater tunnel links UK to Europe in 35 minutes There are actually three tunnels in the incredible underwater engineering marvel that connects Britain to Europe.
Over the next 200 years various plans were made to start the project but none got off (or under) the ground until 1986 when a treaty was signed by the British and French governments to approve the tunnel.
The two sides of the tunnel met up in 1990 and three years later the first test run of trains took place.
There are actually three 25 foot-wide tunnels - two main ones for LeShuttle and Eurostar services and a service tunnel in the middle.
Eleven boring machines dug out the ground and one was so big it couldn’t be removed through the tunnel afterwards so, according to LeShuttle.com, "it simply made a left turn and was buried under the sea".
