The ground beneath the Spanish metropolis of Madrid is crisscrossed by an invisible network of tunnels, shafts and canals.
Director Víctor Moreno explores the secret world, consisting of undiscovered tunnels, subway stations and sewers, beneath our feet. The urban underbelly is a living organism, a thoroughly functional system - but it is also a symbolic place: the subconscious of the city.
"More than a movie, an experience." (Hollywood Reporter)
"A dark and stimulating look into the world that lies beneath our feet." (Variety)
"One of the most important documentary discoveries of the year." (Screen International)