Dipper is the only passerine, to walk and swim under water. Weighing less than 75 g, dipper is yet capable of exceptional prowess. It is in fact, almost two hours a day, that it passes under the tumultuous water of fast and limpid streams. Discreet and fearful, he is misunderstood and sometimes persecuted. It is nevertheless a bio-indicator of water quality. To meet him Yannick Alram spent nearly 1000 hours in river Hers and offers unique images of dipper underwater.