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![50.45-kilometre rail tunnel 75 m deep below the sea bed](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-1.jpg)
50.45-kilometre rail tunnel
75 m deep below the sea bed
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![In the world The longest tunnels: 1) The Gotthard Base](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-2.jpg)
In the world
The longest tunnels:
1) The Gotthard Base Tunnel – 57.09 km( in
Switzerland, 2016)
2) The Seikan Tunnel - 53.85 km(in Japan, 1988)
3) The Channel Tunnel - 50.45 km
With portion under the seabed:
1) The Channel Tunnel – 37.9 km
2) The Seikan Tunnel - 23.3 km
It’s the longest
international tunnel
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![History The idea of a channel tunnel was first conceived](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-3.jpg)
History
The idea of a channel tunnel was first conceived in 1802.
The
successful project began construction in 1988 and opened in 1944.
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![- 2 the main rail for trains - 1small service tunnel](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-4.jpg)
- 2 the main rail for trains
- 1small service tunnel
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![Four types of trains on the line of the Eurotunnel:](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-5.jpg)
Four types of trains on the line of the Eurotunnel:
the high
passenger trains TGV Eurostar(high speed train);
the passenger shuttle trains;
the freight trains with open carriages;
the freight trains.
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-6.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-7.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-8.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-9.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-10.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-11.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-12.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-13.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-14.jpg)
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![](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/92488/slide-15.jpg)