The Basingstoke Canal, completed in 1794, was built to connect Basingstoke with the River Thames at Weybridge via the Wey Navigation, into which it connects at Byfleet, and thus permit boats to travel from the East London docks to Basingstoke. From Byfleet, the canal proceeds west, passing through or near to Woking, Knaphill, Brookwood, Mytchett, Aldershot, Farnborough Airfield, Fleet, Dogmersfield, Odiham, North Warnborough, and Greywell, the present limit of navigation. It was never a commercial success and, from 1950, lack of maintenance allowed the canal to become increasingly derelict. After many years of neglect, restoration commenced in 1977 and on 10 May 1991 the canal was reopened as a fully navigable waterway from the River Wey to almost as far as Greywell Tunnel. Its western end from North Warnborough to Basingstoke remains unnavigable from the point at which it enters the Greywell Tunnel, which partially collapsed in 1932 where it passes from chalk into clay geology. To the west of Greywell tunnel has been extensively filled in or built on. and the bridges demolished.