In the heart of the city, the metro's labyrinthine tunnels echo with the moans of the anonymous. A quick glance, a nod, and two strangers are consumed by their primal urges. Clothing is discarded, bodies pressed against the cool metal of the train, as the city above is oblivious to their carnal dance. The train's stops and starts mimic the rhythm of their lovemaking, as they lose themselves in the moment, their identities a mystery to each other and the world above.