There is a particular bridge in Hong Kong that offers spectacular views: the mouth of a river on one side, and near-identical rows of white apartment blocks and mountains on the other.

No matter where you look, though, you can’t escape the stench of sewage. It wafts up from the treatment plant at Sha Tin, originally built on the city’s fringe but now very much part of Hong Kong, as relentless development has pushed the city outward.

Soon, however, there will be no need to escape: the notorious smell will vanish, as part of Hong Kong’s ambitious plan to move unsightly public works underground.

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