However, the East London line was notorious for smelling of something unpleasant. Particularly the section under the Thames stank of rancid mud. the line is now being upgraded for the Olympics, I imagine they'll be doing something about the smell keep to the Fen Causeway
The Waterloo & City line's epithet of "the Drain" is about right, IMHO and "rancid mud" isn't a bad label for it. "Any economic unit can emit money. The serious problem is to get it accepted" Hyman Minsky