Hi Caz,
I'm sure the average Tehran sewer is not particularly pleasant to go for swim/paddle through. However, I' sure our Uncla Sam's man in Tehran wil be trained to cope by the CIA/Yank Special forces and all. Anyway, its because of his likely state that I very much imagine the SAS guys will fetch up with the old Garden Hose! I mean... they're a pretty hard as nails bunch, I know, but I bet the toughest of even them's stomach would flip one or twice if placed in close proximity for any length of time to some bod who's just been for a dip in the afore mentioned.
FB