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The Eurostar high speed train takes 2 hours and 20 minutes to travel from London to Paris, and 1 hour and 57 minutes from London to Brussels.

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Surveying undertaken in the 20 years before construction confirmed earlier speculations that a tunnel could be bored through a chalk marl stratum.

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Characteristic Geotechnical include:

Four geological strata, marine sediments laid down 90–100 million years ago; pervious upper and middle chalk above slightly pervious lower chalk and finally impermeable Gault Clay. A sandy stratum, glauconitic marl (tortia), is in between the chalk marl and gault clay.

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Successful tunnelling required a sound understanding of the topography and geology and the selection of the best rock strata through which to dig. The geology of this site generally consists of northeasterly dipping Cretaceous strata, part of the northern limb of the Wealden-Boulonnais dome.

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•The speed limit for trains in the tunnel is 160 kilometres per hour (99 mph).

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•the tunnel has the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at 53.85 kilometres (33.46 mi) and deeper at 240 metres (790 ft) below sea level.

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Eurotunel is a 50.45-kilometre (31.35 mi) rail tunnel linking Folkestone, Kent, in the United Kingdom, with Coquelles, Pas-de-Calais, near Calais in northern France, beneath the English Channel at the Strait of Dover.

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https://es.wikipedia.org/wiki/Eurot%C3%BAnel

https://www.google.de/search?q=eurotunel&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj2_NOP6sDSAhVBOSYKHSFJC7MQ_AUICCgB&biw=1440&bih=745#imgrc=dfD0ejeIQlf1VM:

https://www.eurotunnel.com/uk/home/

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Brayan Felipe  Tirano Moreno
Juan Diego Torres Neira