Heathrow Airport - New Baggage Tunnel (London, UK) London Heathrow airport was built in the 1950s in the western part of London, UK. The ground consists of “London Clay” mixed with layers of sand and gravel, the ground water level is at approximately 2 m below surface. The contractor, Ferrovial was working on a TBM driven tunnel as part of the improved airport baggage handling system between the terminals. As the TBM progressed an old servi

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