Is the channel tunnel pressurized?
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# Tunnel
What is the deepest transport tunnel in the world?
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What is the longest underwater tunnel?
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How long is the KPE tunnel in Singapore?
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What is the longest tunnel in Asean?
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What is the longest tunnel in the world?
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Is the chunnel the longest underwater tunnel?
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How long is the Legacy Way tunnel?
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How long is the tunnel from Switzerland to Italy?
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Who built the Marmaray tunnel?
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