Tunnels
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People have been building tunnels for thousands of years. Today, engineers create tunnels beneath cities, through mountains, and even under the ocean. Find out more about how these amazing structures are designed, built, and improved in Tunnels, part of the Engineering Marvels series.
Samantha S Bell
Samantha Bell is the author of more than 80 nonfiction books for kids. She lives in the upstate of South Carolina with her family and lots of pets.
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