The Chiltern tunnel is a breathtaking feat of engineering as the prestigious HS2 runs for 16km beneath the surface of the Chiltern Hills. Along this run there are various headhouses, one of which located in Amersham where the team at SGS are extremely proud to have been awarded our 2nd scope of works on the HS2 project. These works consist of a security vehicle gate paired with radiused security fencing preventing public access to the compound.