Includes bibliographical references (page 47) and index.
Contents:
The First Tunnels -- How Tunnels Work -- Subways and Trains -- Underwater Highways -- Linking Countries -- Tunnels of the Future -- Timeline -- Glossary -- Index -- Show What You Know -- Websites to Visit -- About the Author.
Summary:
"Thousands of years ago, ancient engineers came up with a way to cross obstacles that prevented people getting from one place to another. They built a passageway under the ground called a tunnel. A tunnel sounds simple. After all, it is just a tube built through dirt or stone. But building a tunnel is one of the hardest challenges an engineer can face. This scientific text highlights the origin of the first tunnels, the greatest tunnel builders, the evolution and advancement of tunnels that are being built today, and the complex wonders they are!"
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.