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Presenter: On tonight's edition of City Secrets, reporter Katie Marshall heads for a place that most people would prefer never to visit: the < 1 > .
Katie: It's 1 a.m., and I'm about to join one of the maintenance teams that < 2 > the tunnels that carry London's waste away to be treated.
With nearly fifty thousand kilometres of sewers to < 3 > , the maintenance teams are never short of work.
In fact, some tunnels haven't been checked for fifteen years, and they need to be, because they wee 19th < 4 > re built in th .
Over a hundred and fifty years ago, the British Government ordered sewers to be constructed because a recent < 5 > was polluting the River Thames.
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