Hawthorns Tunnel, also known as Euroclydon Tunnel after the large house built on the grounds above it, is a 638-yard long tunnel built for the Mitcheldean Road & Forest of Dean Junction Railway which was completed but never fully opened. The tunnel was used by the admiralty in the 1940s to store munitions. Now in private ownership, the tunnel may one day be used by the narrow gauge Lea Bailey Light Railway.