What Is The Longest Underground Tunnel London?
The Chiltern Tunnel is the longest tunnel on the HS2 route between London and Crewe. The twin-bore tunnel is 16km (10 miles) long and will carry passengers under the Chiltern Hills. What is the UK’s longest tunnel? Standedge Tunnel & Visitor Centre is located off the A62 in Marsden, between Huddersfield and Oldham. As one …