Add Yahoo as a preferred source to see more of our stories on Google. The 10-mile (16km) Chiltern tunnel runs under the Chiltern Hills [PA Media] Construction has finished on HS2's longest tunnel, ...

Construction has finished on HS2's longest tunnel, which includes extensions with ventilation holes carved out to prevent sonic booms. Trains travelling at 200mph will take only three minutes to go ...

Construction work on HS2’s longest tunnels has been completed. Close of work at the Chiltern tunnel vent shafts at Chesham Road and Little Missenden brings to an end a project that began almost five ...

Add Yahoo as a preferred source to see more of our stories on Google. Wendover resident Andy Band next to the construction site of the so-called green tunnel, which will stretch for almost a mile past ...