How long will it take me to go through the tunnel of Silence?

A young woman, alienated by her work and confronted to her surroundings, falls into a depression that leads her to live in a sewer to find her identity. In there, life is no better; reality appears in images and alegoric figures that change its form and vanishes, without letting the woman communicate with anyone. It's a film with zero dialog in witch the songs takes us through the states of emotion.