The Hidden City (2018)

Interesting facts

The Hidden City is a 2018 documentary film directed by Víctor Moreno. The film explores the underground infrastructure beneath Madrid, Spain, including sewers, pipes, train tunnels, and man-made corridors, with appearances by maintenance workers, animals, and commuters.

Production

In a 2019 interview with Variety, Víctor Moreno stated: "There were three particularly significant difficulties [with filming underground]. The first was obtaining permits that were delayed for about a year as they involved many institutions. The second was the long process of searching for locations since it was a very large space, of which there are hardly any references, and which is as big as the above-ground city.

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