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
Maida Hill Tunnel Venice and Camden Locks, passing through the tunnel and calling at the zoo, and the tunnel is only wide enough for one way traffic. Boats are therefore required to give way if another boat is approaching in the opposite direction. In 2016 the Canal River Trust provisionally opened access to non-powerfed craft such as kayaks, packrafts and canoes. Maida Hill Tunnel Maida Hill Tunnel is a canal tunnel on the Regent's Canal in London, England. The two other tunnels on the Regent's Canal are Islington Tunnel and Eyre's tunnel. The Regent's Canal was authorised by an Act of Parliament in