At 3.25 miles long, Standedge is Britain's longest canal tunnel
Opened in April 1811, Standedge Tunnel is over 200 years old
Typical cargos through the tunnel included wool, coal and horse manure!
Before diesel power, boats were legged through the tunnel
See more at http://canalrivertrust.org.uk/standedge-tunnel
Standedge - disused since 1940s, re-opened in 2001, width restrictions, boat passage is escorted and must be booked