The tunnel through the English Channel, opened in 1994, consists of two tunnels for trains and a service tunnel, each nearly 50 km long.
The undersea part extends about 38.6 km and is the longest trans-sea tunnel in the world.
Hundreds of passengers were trapped for hours in a tunnel under the English Channel between France and Britain because the ship failed.
Getlink, which operates the railway between northern France and south-east England, said 400 people from France to the UK had to disembark and walk after the train crashed in a tunnel under the English Channel on August 24.
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