WHAT ARE THE CHARACTERISTICS OF MODERN TUNNEL CONSTRUCTION?

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  • 1 month ago

    Hole in/ Hole out. Hole lotta work.

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  • Joseph
    Lv 7
    1 month ago

    Really.  You want us to take information that would fill dozens of books and distill it into less than 10,000 alphanumeric characters? 

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  • 1 month ago

    at least one entry and one exit

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  • ?
    Lv 7
    1 month ago

    A big hole under the ground that goes from one place to another

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