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Sewer refers to needle - cleopatra's needle is an obelisk on the Thames embankment

That makes sense now Chris, thank you! I was reading it as a different type of sewer haha!

Thank you zozozo

In fact, the Thames Embankments were a crucial part of Bazalgette's sewerage system for London - a classic example of a successful piece of work done for entirely the wrong reasons (he thought that the smell of sewage caused disease).