What is the longest and deepest road tunnel in the world?
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# Tunnel
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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How does the channel tunnel not leak?
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Is the channel tunnel pressurized?
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