Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jan 27, 2009
What was once the pinnacle of engineering technology is now dated -- so we're reinventing the Hoover Dam. ➡ Subscribe: http://bit.ly/NatGeoSubscribe
About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.