Reply to post: What's a couple of hundred meters between friends?

Swiss effectively disappear Alps: World's largest tunnel opens

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Boffin

What's a couple of hundred meters between friends?

> The completed tunnel travels up to 2.3km below the surface of the mountains above and through rock that reaches temperatures of 46˚C without ventilation due to a high lithostatic pressure from rock above it – which can measure up to 2,500m in some sections*.

So which is it? 2.3km or 2.5km?

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