CNBC - Zig-zagging left and right through a maze of dark, narrow corridors in a high-rise's basement, 35-year-old kitchen worker Hu has joined the many thousands of Chinese fleeing fast-rising property prices by heading down - down underground.

Hu lives here beneath an affluent downtown apartment building, in a windowless, 4 square-meter (43 square-foot) apartment with his wife. For 400 yuan ($65.85) a month in rent, there's no air-conditioning, the only suggestion of heat is a pipe snaking through to deliver gas to the apartments above and the bathroom is a fetid, shared toilet down the hall.

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