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The job of a sewer worker is not easy on a daily basis! It involves checking the condition of underground pipes, which requires moving through waste and smelly water, removing debris that blocks pipes where a dangerous gas sometimes spreads, and dealing with rats. However, Aldo talks about his work with passion. Maïtena then goes to the construction site of the extension of line 12 to Aubervilliers. A complex and very expensive project carried out 20 meters underground by the team of Nicolas, an engineer at the RATP. The longest underground network in the capital is not, however, that of the Paris metro.