Been saying that for years. I was fortunate to go on a tour of the underground canal linking the Irwell to the Bridgewater canal (from Granada studios, underneath the Great Northern Warehouse and GMEX and Bridgewater Hall).@Mad Eyed Screamer Thanks for sharing this mate. Fascinating stuff. All that silt and grime from the bygone era of the Manchester industrial revolution tells a tale. It would make even more interesting viewing if the narrator wasn't such a "it's getting too deep" wimp. He's got chest waders yet he's yelling like a big girls blouse when the waters starts getting over his knees, and he has a depth gauge stick! Also could have done with a GoPro cam attached to his helmet.
The Environment Agent or/and Canal And River Trust could make a fortune out of the underground labyrinth of water under the city if they cleaned the rubbish and desilted it. They could dam it and have punts sailing through it. I think people would pay to tour what looks like interesting viewing of the architecture and course of the Medlock under the city's streets.
Entered via some steps in the GN Warehouse and into another world. It was actually used as an air raid shelter during WW2.
I suspect the reason they wont be opened up as tourist attractions is access to these places and the usual H&S regulations.