The Continent won't be isolated any more

The Channel Tunnel (French: Le tunnel sous la Manche), (also informally known as the Chunnel) is a 50.5-kilometre (31.4 mi) undersea rail tunnel linking Folkestone, Kent near Dover in the United Kingdom with Coquelles, Pas-de-Calais near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point, it is 75 metres (250 ft) deep.At 37.9 kilometres (23.5 mi), the Channel Tunnel possesses the longest undersea portion of any tunnel in the world.

The tunnel carries high-speed Eurostar passenger trains, Eurotunnel Shuttle roll-on/roll-off vehicle transport—the largest in the world—and international rail freight trains. The tunnel connects end-to-end with the LGV Nord and High Speed 1 high-speed railway lines. In 1996 the American Society of Civil Engineers identified the tunnel as one of the Seven Wonders of the Modern World.

Ideas for a cross-Channel fixed link appeared as early as 1802, but British political and press pressure over compromised national security stalled attempts to construct a tunnel. However, the eventual successful project, organised by Eurotunnel, began construction in 1988 and opened in 1994. The project came in 80% over its predicted budget.Since its construction, the tunnel has faced several problems. Fires have disrupted operation of the tunnel. Illegal immigrants and asylum seekers have attempted to use the tunnel to enter Britain, causing a minor diplomatic disagreement over the siting of the Sangatte refugee camp, which was eventually closed in 2002.
Total cross-tunnel passenger traffic volumes peaked at 18.4 million in 1998, then dropped to 14.9 million in 2003, from then rising again to 16.1 million in 2008.

At the time of deciding to build the tunnel, 15.9 million passengers were predicted for Eurostar trains in the opening year. In 1995, the first full year, actual numbers were a little over 2.9 million, growing to 7.1 million in 2000, then dropping again to 6.3 million in 2003. However, Eurostar was also limited by the lack of a high-speed connection on the British side. After the completion of High Speed 1 (formerly CTRL) to London in two stages in 2003 and 2007, traffic increased. In 2008, Eurostar carried 9,113,371 passengers in cross-Channel-Tunnel traffic, a 10% increase over the previous year, despite traffic limitations due to the 2008 Channel Tunnel fire.