Blisworth Tunnel has no tow path inside, but is wide enough for two narrowboats to pass in opposite directions. Work began in 1793, but errors by contractor left a wiggle in the tunnel, and after three years work it collapsed due to quicksand, claiming the lives of 14 men. It was then decided to begin again with a new tunnel. By the time the rest of the Grand Junction Canal had opened between London and Braunston, Northamptonshire in 1800, apart from the crossing of the River Great Ouse, the section of canal from Blisworth to the lower end of Stoke Bruerne locks
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.