Does Norway have underwater tunnels?
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# Tunnels
How do underground tunnels not collapse?
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What is the main purpose of a tunnel?
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Which country has the most tunnel in the world?
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Are the tunnels in Ho Chi Minh worth visiting?
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Which is better Ben Dinh tunnels or Ben Duoc tunnels?
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Do cell phones work in tunnels?
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What are the best tunnels in Vietnam War?
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