The film shows a young child playing in a swimming pool until he hits his head and disappears underwater

The boy's mother rushes to his aid, appearing to crawl across the surface of the water on an invisible barrier – a barrier which prevents her reaching her drowning child despite her desperate attempts to break through. The film lingers on the parent's increasing feeling of despair. The barrier is a metaphor for the mother's helplessness.

It's confronting, but not as confronting as the thought that you could have helped to save a life.