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The chalk marl runs along the entire length of the English side of the tunnel, but on the French side a length of 5 km (3.1 miles) has variable and difficult geology. The tunnel consists of three bores: two 7.6 m (24 ft 11 in) diameter rail tunnels, 30 m (98 ft) apart, 50 km (31 miles) in length with a 4.8 m (15 ft 9 in) diameter service tunnel ...
Channel Tunnel: English Channel, United Kingdom/France 50,450 m (31.348 mi) 1994 Second longest railway tunnel until 2016. Longest underwater section, longest international tunnel (2×45 m 2 + 1×18 m 2), running between Folkestone, Kent, and Coquelles, Pas-de-Calais. Railway Single Tube Yulhyeon Tunnel: Seoul Capital Area, South Korea
The English Channel, [a ... 29,000 square miles). [4] The Channel aided the United Kingdom in ... Many travellers cross beneath the Channel using the Channel Tunnel ...
By way of comparison, the 50-kilometer (31-mile) Channel Tunnel linking England and France, completed in 1993, cost the equivalent of £12 billion ($13.6 billion) in today’s money.
The Channel Tunnel operates between Great Britain and France. It is a 31.35 miles (50.45 km) 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. At its lowest point, it is 75 m (250 ft) deep.
Channel Tunnel to the United Kingdom (railway through the English Channel), at 50.5 km (31.4 mi); International Tunnel de Bielsa-Aragnouet France – Spain: total length 3.07 km, diameter 7.5 m, 100 m minimum distance between one after another vehicles, asphalt lane 6 m wide, for vehicles high max 4.3 m, max speed 60 km/h (37 mi/h)
A tunnel would likely be an electrified rail tunnel with car shuttles due to the depth of the Strait of Gibraltar (up to 900 metres (3,000 ft)) and the length of the tunnel making it a great challenge to remove vehicle exhaust. Similar considerations led to the Channel Tunnel linking the UK and France not being a highway tunnel.
Length in km (mi) Year completed Line Gotthard Base Tunnel: Switzerland 57.104 km (35.5 mi) & 57.017 km (35.4 mi), 2 tubes 2016 new Gotthard railway: Seikan Tunnel: Japan (Tsugaru Strait) 53.85 km (33.5 mi) 1988 Kaikyo Line (Hokkaidō Shinkansen) Channel Tunnel: France/United Kingdom (English Channel) 50.45 km (31.3 mi), 3 tubes 1994