In the late twentieth-century, a twenty-four-hour non-stop service culture emerged in many of the world’s cities. In industries such as hospitality, cleaning, cooking and waste disposal, a constant feed of human labour is required. In many places today, from the US to China, inexpensive migrant labour is used – amid unregulated, often exploitative and dangerous conditions. In Beijing, it is estimated that upwards of one million of the city’s inhabitants are low-wage migrant workers living literally underground in the city’s former air-raid shelters. These underground spaces of Beijing were first built by Mao Zedong as protection against Soviet air strikes; in the 1990s, among economic reforms, they were partly privatised and incorporated into newly built above-ground residential housing, and leased at a low cost. Today, they are home to many of the city’s waiters, security guards, cleaners, cooks, nannies and drivers who serve one class but belong to another.Sim Chi Yin’s project Rat Tribe is a portrait of the migrants inhabiting these 6,000 basements and air raid shelters, which amount to nearly a third of the city’s underground spaces. Taken over a five-year time span, Chi Yin’s photographs adopt – with deliberate irony – the pejorative name (‘rat tribe’) coined by the Chinese media for this layer of society that resides underground in Beijing, sleeping in cramped quarters with no or little natural light and only a modicum of comfort in order to live within proximity to the city centre where they work. A portrait of the all-too-physical costs of globalisation, Chi Yin’s project calls attention to the effects of global capital in cities, while putting a human face on the realities of migration and exploitation that some are never forced to examine. Despite the harsh realities depicted in these photographs, we also catch a glimpse of human individuality breaking through the surface: they show how the walls and interiors are decorated to express the personality and pride of those leading even the most precarious of lives. And once above ground, these so-called ‘rats’ look no different from their counterparts who live upstairs.