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Betty and Liva win out

By next February two full face earth pressure balance tunnelling machines will have completed a near three year battle through difficult ground beneath Copenhagen's main streets to achieve all 16.6km of tunnelling for the £600M metro. The twin machines - christened Betty and Liva after local music hall stars - have linked all six city centre underground station boxes and nine deep ventilation shafts, several of which were initially used for construction access.

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