Hong Kong is one of the wettest cities in Asia. But despite the torrential rains, the city is safe from large-scale flooding that routinely paralyses other Asian cities. It’s all thanks to a massive – and expensive – network of underground stormwater drainage tunnels that safely diverts rainwater to the sea. Follow SCMP’s Alkira Reinfrank on a trip deep beneath the city’s streets into a massive tunnel system that’s hidden right beneath our feet.