There are many waterways that run underneath London. This was a serious problem when Bazelgette's sewers were being installed because records of these rivers and brooks were few and far between and also landslips and natural erosion had changed their courses over time. Not all the sewers were cut and cover; some had to be tunnelled with untested and poorly regulated drilling machines at great risk to the men working with them and the nearby population. Death rates were high.
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