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Continue to Chathttps://www.telegraph.co.uk/travel/picturegalleries/8067107/Gotthard-Tunnel-a-giant-drilling-machine-completes-the-worlds-longest-tunnel-beneath-the-Swiss-Alps.html
https://www.telegraph.co.uk/travel/picturegalleries/8067107/Gotthard-Tunnel-a-giant-drilling-machine-completes-the-worlds-longest-tunnel-beneath-the-Swiss-Alps.html