Why a Giant Machine Is Digging a Tunnel Under DC National Geographic

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A colossal machine called the Lady Bird is boring a huge tunnel under Washington, D.C., to channel storm water for treatment, keeping runoff out of the city's notoriously polluted rivers. The $30 million machine is named for Lady Bird Johnson, who, as First Lady of the United States, had advocated for cleaner rivers around the nation's capital. • ➡ 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. • Get More National Geographic: • Official Site: http://bit.ly/NatGeoOfficialSite • Facebook: http://bit.ly/FBNatGeo • Twitter: http://bit.ly/NatGeoTwitter • Instagram: http://bit.ly/NatGeoInsta • Click to learn more about the Lady Bird and the tunnel it's digging: • http://news.nationalgeographic.com/ne... • PRODUCER AND VIDEOGRAPHER: Jason Kurtis • EDITOR: Nick Lunn • Why a Giant Machine Is Digging a Tunnel Under D.C. | National Geographic • • Why a Giant Machine Is Digging a Tunn... • National Geographic • / natgeo

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