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Watch The Five Billion Pound Super Sewer Season 1 Episode 2 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Filmed over three years, charts the progress and setbacks faced by a team of 4000 construction workers tasked with creating London's deepest ever tunnel - directly beneath the river Thames. It also delves into the subterranean world to explore the state of the city's ageing sewer network.