HS2 main works contractor Align JV – Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick – has started excavating one of five giant ventilation and emergency access shafts.
The shafts will provide access to the 10-mile-long tunnels Align JV is digging under the Chiltern Hills.
Once complete, the 78m deep shaft near the village of Chalfont St Peter will be topped with a headhouse inspired by nearby barns and other agricultural buildings to help it fit into the surrounding landscape.
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