Channel Tunnel 25 anniversary: 25 amazing facts about the engineering marvel

Channel Tunnel 25 anniversary: 25 amazing facts about the engineering marvel

To mark the 25th anniversary of the opening of the Channel Tunnel here are 25 facts about the modern engineering marvel. 

1. The Channel Tunnel is 50.5 kilometers long making it the 13th longest tunnel in use the longest is the Delaware Aqueduct at 137 km and the fourth longest used by rail passengers. It has the longest undersea portion of any tunnel in the world 37.8 km.

2. The project cost 4.65£ billion equivalent to 12£ billion or A22.3$ billion today 80% more than expected. Construction took 6 years 1988-1994.

3. It was considered as one of the "7 Wonders of the Modern World by the Empire State Building the Itaipu Dam in South America the CN Tower in Toronto the Panama Canal the North Sea protection works in the Golden Gate Bridge in San Francisco and the Netherlands.

4. The 1st proposal was put forward by Albert Mathieu a French engineer it included an artificial island for changing horses. The other proposals were considered by William Gladstone in 1865 and Napoleon III in 1856 while David Lloyd George brought up the idea at the Paris Peace Conference of 1919.

Ideas for a tunnel under the English Channel go back to the early 1800s. Photo: AP

5. At the 8 of construction 13,000 people were employed. Ten workers eight of them British were killed building the tunnel.

A Channel Tunnel drill sits as a memorial to workers in Calais, France. Photo: Alamy 

6. Englishman Graham Fagg and Frenchman Phillippe Cozette carried out the ceremonial break through on December 1 1990.

7. They didn't meet in the middle the English side tunneled the greater distance.

8. The average depth of the tunnel is 50 meters below the seabed and the lowest point 75 meters below. The chalk marl spoil on the English side was deposited at Lower Shakespeare Cliff in Kent now home to the Samphire Hoe Country Park.

9. There are actually three tunnels down there 2 for trains and a smaller service tunnel that can be used in emergencies.

10. Eleven boring machines were used to dig the tunnel. Together they weighed a total of 12,000 tonnes more than the Eiffel Tower while each was as long as 2 football pitches. From the British side buried under the Channel. Another was sold on eBay for 39,999£ in 2004.

A worker during the construction in 1990. Photo: AP

11. An average of 60,000 passengers pass through the tunnel each day along with 4600 trucks 140 coaches and 7,300 cars.

12. 3 fires have happened in 1996 2006 and 2012 inside the tunnel which were significant enough for it to close. The most serious on November 18 1996 damaged 500 meters of the tunnel affecting operations for 6 months. An automatic fire dousing system has now been installed.

13. A number of train failures have occurred. On December 18 2009 5 Eurostar trains broke down trapping 2,000 passengers for 16 hours without power and many without food or water.

15. The Olympic Torch traveled through the tunnel in 2012 on its way to host city London.

16. Shuttle trains are 775 meters long the same as 8 football pitches.

17. The tunnel is designed to last for 120 years.

18. It takes around 35 minutes to travel the length of the Channel Tunnel.

19. The introduction of a pet travel scheme in 2000 has seen more than 2 million dogs and cats travel through the tunnel.

20. The Queen and President Mitterrand officially opened the tunnel on May 6 1994. The royal party traveled from Waterloo to Calais at a sedate 129 km/h. The presidential party sped to the coast from Paris at 300 km/h.

21. In 2009 former F1 racing champ, John Surtees, drove a Ginetta G50 EV electric sports car through the service tunnel from England to France as part of a charity event. He kept to the 50 km/h speed limit.

22. To commemorate the 2014 Tour de France, which started in Leeds, England and finished in Paris, Chris Froome of Team Sky rode through the service tunnel, becoming the first solo cyclist to do so. He didn't keep to the limit, reaching speeds of up to 65 km/h.

23. The Channel Tunnel has starred in a grisly crime TV drama aptly named The Tunnel which followed a British and French detective as they worked to find a serial killer who left the upper half of a French politician and the bottom half of an English prostitute at the tunnel's half-way point.

24. On a cheerier note around 12 million roses are delivered through the tunnel every year for Valentine's Day.

25. A reported 26% of trade in goods between the UK and continental Europe goes through the Channel Tunnel each year which represents a total value of 120£ billion annually.

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