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
Eyre's Tunnel passes above the tunnel. Eyre's Tunnel Eyre's tunnel or Lisson Grove Tunnel is a short canal tunnel on the Regent's Canal that passes under Lisson Grove in St John's Wood, north London and opened in 1816. It is only 48 metres long. The two other tunnels on the Regent's Canal are Islington Tunnel and Maida Hill Tunnel. Unlike the other tunnels, Eyre's Tunnel has a (now fenced) towpath. The tunnel was originally known as Eyre's Tunnel due to its passing beneath land belonging to Richard Eyre, a local landowner. Lisson Grove is a more recent usage clearly following the renaming