Synopsis
The 10 most extreme bridges on Earth: from Nepal and Japan to Bolivia and Russia, bridges that demonstrate extreme engineering and stand in unforgettable locations.
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Episode 3 | The Five Billion Pound Super Sewer
Following workers across London over three years as they race to build an enormous supersewer on time and on budget. In this episode, tunnelling in central London finally begins.

Episode 2 | The Five Billion Pound Super Sewer
Following workers across London as they race to build an enormous supersewer. The first episode follows the creation of the first stretch of the supersewer in east London.