But then things got interesting as we approached Pedimore Road. The towpath opened out and there was a length in water. Well, I say in water when really I should say in oily scum. For nearly 100 yards the canal bed had been converted into a huge open air cooling pond into which hot oily water is poured and cooler oily water is extracted. Accounts from the 1970's suggest that this has been going on for decades so maybe this could lay claim to being the most polluted bit of canal on the BCN.