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After a year stuck below ground in freezing soil, the second of two Lovat tunnel boring machines driving the 10.6km long HumberCare sewer transfer tunnels has finally been brought to surface. The 236t machine, christened Maureen, was lifted out at an end shaft last Thursday after underground renovation had allowed it to complete its half of the the £54M worth of drives following a lining collapse in November 1999. Miller Civil Engineering Services used ground freezing to rescue the machine and rebuild the damaged section of the concrete segment lined tunnel (NCE 7 September 2000).

Rescue and investigation of the collapse was coordinated by Ove Arup and the client was Yorkshire Water.

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