The world's deepest tunnel that's an incredible 35 miles long that cost £9.6bn
At 2,300 metres deep and 57 kilometres long, the Gotthard Base Tunnel broke records when it opened to traffic in 2016.
The idea of making a new tunnel in the Swiss Alps to connect the North Sea and the Mediterranean train was first thought up in the 1960s.
……Read full article on Daily Express - World
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