Visited solo
Thanks to The village idiot for this one
This is part of a flue to a huge chimney and as chimneys go its a very nice one, and would make for an awesome abseil. The chimney is known locally as barrow bridge mill chimney, but in fact never served barrow bridge mill at all as its too far away. But instead served Smithills bleach works which was situated off smithills croft road. It was built in late 18th century and the parts that are still fairly well intact show a really nice brickwork. But the majority of the tunnel has seen better days as there are a lot of collapses.
The actual length of the flue that is accessible is probably around 40 - 50 meters. There appears to be more but with a collapse at both ends thats all that can be seen today. Although when you get to the side that is closest to the chimney where it splits you can feel and hear air rushing past. What did surprise me about this was the actual size of it, it must of been around 7 foot tall in parts.