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HS2's first Tunnel Boring Machines (TBMs) excavating HS2s longest tunnels have completed the first 4 miles of their drive from the Chiltern tunnels south portal to the second ventilation shaft at Chalfont St Giles.
(Permalink) Chiltern Tunnels HS2 TBM Chiltern Tunnels: Tunnel boring machines 'Florence' and 'Cecilia' have reached a 4 mile point at Chalfont St Giles. |