BUILDING BIG Tunnel Basics
Tunnel Basics
Tuesdays in October on PBS (check local listings) _  
Forces that act on an Underwater Tunnel.

Underwater Tunnel: Forces
Water pushes on the sides of the tunnel. The tunnel's walls are squeezed by the water.



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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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