HS2: Design of last visible part of Chiltern tunnel revealed

The design of the last visible structure along the route of HS2’s longest tunnel has been revealed.

The north portal of the 10-mile (16km) Chiltern tunnel, will be built low into the landscape between Great Missenden and South Heath in Buckinghamshire, HS2 Ltd said.

It will be partially visible from a footbridge over the railway.

It is one of seven “key design elements” which will be the only visible part of the twin tunnels.

The tunnels, which are between the M25 and South Heath, have five shafts for emergency access and/or ventilation near Chalfont St Peter, Chalfont St Giles, Amersham, Little Missenden and Chesham Road.

The other visible elements include the south portal near the M25 and the headhouses above the five shafts, which are mostly designed to resemble agricultural buildings.

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