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
Lapal Tunnel section of canal from a new junction with the Worcester and Birmingham Canal to the recently reconstructed Harborne Lane bridge. Lapal Tunnel The Lapal Tunnel (old spelling Lappal Tunnel) is a disused canal tunnel on the five mile dry section of the Dudley No. 2 Canal in the West Midlands, England. It takes its name from the settlement of Lapal. The narrow brick-lined tunnel, built in 1798 by William Underhill, had no towpath. It had a very small bore - at 7 feet 9 inches, barely wider than the boats which used it, with a headroom of only 6 feet.