Tunneling With A Mechanical Worm On Steroids
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Mexico City was founded on an unstable lake bed at the bottom of a volcanic crater. The soil is so soft that the city has sunk thirty feet in the last century alone. Blasting to create tunnels would topple buildings, so the government turned to giant tunnel boring machines capable of churning out 44 million horsepower--the same force could launch a space shuttle. | http://www.sciencechannel.com/
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Catch DIRTY GREAT MACHINES Mondays at 10/9c on Science!
Subscribe to Science Channel:
http://www.youtube.com/subscription_center?add_user=sciencechannel
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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