In which country is the world’s longest road tunnel?
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# Tunnel
How do tunnels under mountains not collapse?
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What is the longest and deepest road tunnel in the world?
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What is the longest underground expressway in Singapore?
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Does Eurostar have WiFi in the tunnel?
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Is there an underwater tunnel in China?
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Why did the light come on when the train went through the tunnel?
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Is the Chunnel claustrophobic?
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Is the legacy tunnel one way?
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Is there a gas pipeline in the Channel tunnel?
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