在海拔4000米的安第斯山脉Perou。在那靠近云朵的地方，美洲驼过去常在那吃草，棕色的水从岩石中迸出。一名老师和她的学生正在取样浑浊的液体，以便在学校实验室进行分析。随后，学生从样本中辛苦的提取出了小“虫子”。如果一个地方有虫子，证明一定有生命，对吧？错了，那些是铅。这些无脊椎动物是水受到污染的科学证据。但谁想要相信他们？像其他人一样，华谊社区的存亡取决于矿...而当矿工看到这种动乱危及他的工作时，他的女儿就相信有一天，事情可能会改变。 Altitude: 4000 meters. We find ourselves in the Andes, Perou. Up there, near the clouds, where the llamas used to graze, brown water springs from the rocks. A teacher and her pupils are sampling the murky liquid in order to analyse it in the school lab. Later, from the samples, the pupils diligently extract tiny 'bugs'. And where there are bugs, there is bound to be life, right? Wrong. There is lead. Those invertebrates are a scientific proof that the water is contaminated. But who wants to believe them? Like so many others, the survival of the community of Huayhuay depends on the mine.... And while a miner is witness to the upheavals jeopardising his job, his own daughter comes to believe that, one day, things may change.