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        Super Tunnel | Extending London's Underground Railway

        Learn how engineers are building a new metro line beneath central London that connects with the city’s existing Underground network, in this media gallery from NOVA: Super Tunnel. Two videos detail the engineering challenges and the technologies used to dig a tunnel without disrupting the busy streets above. To remove earth, the project uses eight tunnel-boring machines, each 490 feet in length and 1,000 tons in weight. To help ensure safety at the surface, a network of lasers and targets monitors building movements that may result from disturbing the ground below. This resource is part of the NOVA Collection.

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        Tunneling Under London

        This video explains the engineering challenge involved in connecting a new tunnel and 10 new cross-rail stations into the existing London Underground network.

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        Technologies for Building Tunnels

        This video examines how a tunnel-boring machine works and the network of lasers and targets used to monitor the movement of buildings at the surface that may occur during underground digging operations.

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