Article in the Telegraph:
There, in the city's vast network of unused air defence bunkers, as many as a million people live in small, windowless rooms that rent for £30 to £50 a month, which is as much as many of the city's army of migrant labourers can afford.
... "We have two sizes of room," he says, stepping past heaps of clutter belonging to residents, most of whom work in the nearby cloth wholesale market. "The small ones [6ft by 9ft] are 300 yuan [£30] the big ones [15ft by 6ft] are 500 yuan."
"Some 80pc of our tenants are girls working in the wholesale market and the rest are peddlers selling vegetables or running sidewalk snack booths," he adds. "There are dozens of similar air defence basement projects in residential communities. In this area, they say 100,000 live underground."