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        3-8

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        Part of Building Big
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        The Tunnel Challenge

        With state-of-the-art equipment at their disposal, it seems that nothing stands in the way of today's tunnel engineers. Try your own hand at tunneling, using this interactive activity from the Building Big website. Choose from among several tools and techniques to build a safe and stable tunnel through a mountain, under a river, and beneath a city.

        This resource can be found on the Building Big Web site.

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