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Breakthrough of the North Downs Tunnel on the Channel Tunnel Rail Link came two months ahead of schedule, marking a milestone in construction of the 3.2km tunnel over 100m below Bluebell Hill. The 13m wide, 10m high single bore tunnel is being constructed with a sprayed concrete lining similar to that used on the troubled Heathrow Express project. However this tunnel passes almost entirely through chalk rather than soft London clay. The breakthrough will see only the tunnel crown complete ...

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