Blisworth Tunnel 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 on the UK canal network after Standedge Tunnel and Dudley Tunnel (and the ninth-longest canal tunnel in the world). At its deepest point it is "ca."143 feet ("ca."43m) below ground level. The tunnel
Blisworth ore quarries were opened to the west of the village in about 1873,operating to the north of the Gayton Road until 1895 and south of the road from 1895 to about 1913. Horse Tramways connected these quarries eastwards to the canal and westwards to the railway. A new quarry operated to the south of these in 1942 and 1943 and between 1954 and 1967. This was the only iron quarry at Blisworth to use mechanical diggers. They were electric and diesel powered. The quarry was connected by standard gauge steam operated tramway to sidings on the railway at Gayton south