In the documentary entitled "Hyas", the spectacular dominates. The crustaceans Hyas and Stenorinques are shown, absolutely opposite in form but always found together and dressed either in algae or sponges, in a setting of algae and sponges with which they often blend in, which allows for some rather pretty effects. The finesse of the Stenorinque and the grotesqueness of the Hyas are associated with the splendor of the Spirograph worm which displays on the screen the fireworks of its gill plume. The object of this film was above all, even in the enormous enlargements of the gills, the decorative research and the photographic presentation.