Constructing the Hoover Dam

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=eBLkJbloXhA

When it was originally built, the Hoover Dam was the largest concrete structure in the world. It weighs 6.6 million tons and stands 700 ft tall. The biggest challenge engineers faced while building the dam was the extreme heat. • #ImpossibleEngineering • Wednesdays 9/8 on Science • http://www.sciencechannel.com/tv-show... • Subscribe to Science Channel: http://bit.ly/SubscribeScience • Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT • Download the TestTube app: http://testu.be/1ndmmMq

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