The Channel Tunnel, one of Europe's biggest infrastructure projects to date.

The $15 billion Channel Tunnel makes the old dream of a ground link between Great Britain and continental Europe a reality for the first time since the Ice Ages.

The tunnel is made of 3 interconnected tubes: 1 rail track each way plus 1 service tunnel.

Its length is 31 miles and 23 miles are underwater.

Its average depth is 150 feet under the seabed.

95 miles of tunnels were dug by nearly 13,000 engineers, technicians and workers.

The volume of rubble removed from the tunnel is three times bigger than that of the Cheops Pyramid in Egypt. And it has increased the size of Britain by 90 acres. Which is the same as 68 football fields, this area has been made into a park.