A Eurostar train enters the Eurotunnel, Cheriton, Folkestone, Kent. United Kingdom. The Channel Tunnel is a 50.45-kilometre rail tunnel linking Folkestone, Kent, in the United Kingdom, with Coquelles, Pas-de-Calais, near Calais in northern France, beneath the English Channel. (photo by Andrew Aitchison / In pictures via Getty Images)
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