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
Stad Ship Tunnel Norwegian Coastal Administration concluded that a tunnel would not be economical. It looked at two sizes, small and large, which would cost respectively. The report concluded that the utility, including saved waiting costs, for shippers have a present value of , respectively, and in saved accident costs. A similar report from 2007 concluded that the tunnel would be economical. The Coastal Administration stated that the differences were because of new and better data. Stad Ship Tunnel The Stad Ship Tunnel () is a proposed canal and tunnel to bypass the Stad peninsula in Selje Municipality in Sogn og Fjordane county,