Sewer

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There is more information available on this subject at Sewer on the English Wikipedia.

A sewer is an artificial conduit or system of conduits used to carry and remove sewage and to provide drainage. Human-built sewers are usually pipelines that begin with connecting pipes from buildings to one or more levels of larger underground horizontal mains, which terminate at sewage treatment facilities. Vertical pipes, called manholes, connect the mains to the surface. Sewers are generally gravity powered, though pumps may be used if necessary. Sewage pipelines are unconnected to other pipelines such as those for potable water.

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During their assault on Côte d'Azur, Spartan Blue Team used the sewer systems to navigate through the city undetected.[1]

During the Battle of Cleveland, UNSC Marines used the city's sewers as entrance to their base.[2]

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