How do we tunnel under cities today?

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How do we tunnel under cities today?
« on: 15/10/2013 19:26:44 »
How do the tunelling machines digging a new underground train tunnel in London actually work?
Read a transcript of the interview by clicking here

or [chapter podcast=1000523 track=13.10.15/Naked_Scientists_Show_13.10.15_1001479.mp3] Listen to it now[/chapter] or [download as MP3]
« Last Edit: 15/10/2013 19:26:44 by _system »