Manche Tunnel

The Channel Tunnel is a 50.45-kilometer underwater railway tunnel connecting Folkestone in the Kent region of the United Kingdom with Coquelles near Calais in France. Its 37.9-kilometer section passes beneath the English Channel, making it the longest underwater tunnel in the world.

The idea of the tunnel was first proposed in 1802 by engineer Albert Mathieu. The concept resurfaced periodically throughout the 19th century, with the first drilling attempts carried out in 1880 at Abbot’s Cliff. However, the modern project was only launched in 1986 under the leadership of British Prime Minister Margaret Thatcher and French President François Mitterrand; construction began in 1988 and was completed in 1993. The tunnel opened for service in 1994 after a six-year construction period.

The Channel Tunnel consists of three parallel tunnels: two main railway tunnels and one service tunnel. The tunnel descends up to 75 meters below sea level and is excavated approximately 40 meters below the seabed. Both freight and passenger transport operate within the tunnel system. Additionally, a dedicated service tunnel is available for emergency use.

Approximately 13,000 workers were involved in the tunnel’s construction, using specially designed Tunnel Boring Machines (TBMs) for excavation. Safety measures were given high priority in the design, particularly through the implementation of the three-tunnel system.

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The project was entirely financed by private capital. The initial estimated cost of 4.8 billion GBP (approximately 6.2 billion USD at 1985 prices) ultimately increased by 80 percent to 9.5 billion GBP (approximately 11.8 billion USD at 1994 prices). The project was funded through approximately 8 billion GBP in borrowing and shareholder contributions.

The tunnel is operated by Getlink (formerly Eurotunnel). Passengers can travel with their vehicles using the Le Shuttle service, while high-speed Eurostar trains connect major European cities such as London, Paris, Brussels, Amsterdam, and Cologne. Eurostar reaches speeds of 160 km/h within the tunnel and up to 300 km/h outside it.

The Channel Tunnel provides a fixed transport link between continental Europe and the United Kingdom. As of 2016, it is estimated to facilitate 26 percent of UK-EU trade. The tunnel has enhanced tourism, trade, and transport efficiency, offering an alternative to road and ferry transport.

Beyond its engineering achievement, the Channel Tunnel has provided a permanent solution to longstanding transport challenges between the two countries, generating significant economic, political, and social impacts.