Video of the Week: Diving down into the depths of the Channel Tunnel.

The Channel Tu Channel Tunnel video.jpg nnel is the UK's first high-speed railway which connects Southern England with the North of France. The idea was put in motion over 200 years ago, but tunneling did not begin until 1988, and eventually opened for passengers in 1984. It still stands as the longest undersea portion of any tunnel in the world and at its lowest point, it is 75 m (250 ft) deep below the sea bed, and 115 m (380 ft) below sea level.The 50.45-kilometres worth of engineering has successfully connected an island nation with a continent. This week's video provides a unique insight into the Channel Tunnel and explains how evacuations are carried out and what you can expect when Britain and France meet halfway though the undersea network.