I had been expecting a strong stink of human waste, but the team tell me that 90% of the liquid rushing past my feet is < 11 > , which reduces the smell considerably.
They also tell me that despite the popular < 12 > , there aren't many rats. Apparently, they aren't keen on flowing water.
However, the men do have an < 13 > that they have to fight every night: fat.
The increase in fast-food restaurants has seen an increase in the amount of hot, liquid fat that is poured into the sewers, but when it arrives in the tunnels, it goes cold and forms < 14 > blocks.
Solid fat is dangerous because it < 15 > tubes, but unfortunately it's very hard to remove.
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