Blisworth Tunnel sections lined with pre-cast concrete rings. It was also used to test out the materials that were later used on the Channel Tunnel. An unused ring is on display near the south portal. Blisworth Tunnel Blisworth Tunnel is a canal tunnel on the Grand Union Canal in Northamptonshire, England, between the villages of Stoke Bruerne at the southern end and Blisworth at the northern end. The northern end is about from the northern end of the Grand Junction Canal at Braunston, Northamptonshire and the southern end about . At 3,076 yards (2,813m) long it is the third-longest navigable canal tunnel
Dudley Canal remaining route to the tunnel mouth is traceable, and the Lapal Tunnel Trust have carried out some restoration, as they have also done on the section from the eastern portal to the Worcester and Birmingham Canal at Selly Oak. Dudley Canal The Dudley Canal is a canal passing through Dudley in the West Midlands of England. The canal is part of the English and Welsh connected network of navigable inland waterways, and in particular forms part of the popular Stourport Ring narrowboat cruising route. The first short section, which connected to the Stourbridge Canal, opened in 1779, and this was