On the island of Phu Quoc, in Vietnam, men live on vast rafts. At the same time home and fish tank they welcome dogs and birds on the surface and, under the surface, all that the fishermen will have collected during their daily expeditions: fish, shellfish, sea urchins. These fishermen use a hookah to breathe away from the surface. Thin thread of life, it allows them to stay very long in the blue depths.