BUILDING BIG Tunnel Basics
Tunnel Basics
Tuesdays in October on PBS (check local listings) _  
Section of Brunel's tunnel shield
Used to dig Thames Tunnel
London, England

Image of Brunel's tunnel shield
Reproduced by Kind Permission of the Institution of Civil Engineers, London


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_There's even more to explore at the BUILDING BIG web site, check it out at www.pbs.org/buildingbig.



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