It's just after 1pm on a Monday and three old friends are attempting to dredge a section of the Manchester, Bolton & Bury Canal by hand. It's dirty, smelly, back-breaking work, but Carol Garner, Sarah Greenhalgh and Lynne Curley are happily giving up their free time to do it.
"When we were kids this canal was clear," says Carol. "Everyone learnt to swim in here. We're just trying to get it back to how it was."
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