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Deputy Prime Minister John Prescott was this week scheduled to witness the breakthrough of the North Downs Tunnel on the Channel Tunnel Rail Link, two months ahead of schedule. The moment will mark a milestone in construction of the 3.2km tunnel - the UK's first high-speed rail tunnel - over 100m below Bluebell Hill at the central point in the tunnel. The 13m wide, 10m high single bore tunnel which starts from Boxley Valley north of Maidstone and emerges alongside the M2 south of Chatham ...

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