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11
Images: Tunnelling and the South Portal compound
Images: Cross passages
Images: South Portal landscaping - Western Valley Slopes project
Images: Chalfont St Peter headhouse
Images: Chalfont St Giles headhouse
Images: Amersham headhouse
Images: Little Missenden headhouse
Images: Chesham Road Intervention Shaft
Images: North Portal
Images: At the factory - building the tunnelling machines
Archive images: Chiltern tunnel - preparing for the start of tunnelling (2019 - May 2021)