Claudio Gazzaroli is a plumber by profession and an underwater filmmaker by passion. He engages with water both for his work and for his greatest interest: capturing the hidden beauty of the underwater world through his camera. The journey that director Fulvio Mariani takes with him begins on his doorstep, in the small lakes, ponds, and pools of the Canton of Ticino, where they both live and where Claudio, through years of diving, has collected astonishing images of underwater creatures, using a refined, self-taught filming technique. Other creatures include the haenyeo (women of the sea), legendary free-diving fishermen from Jaju Island, whom the two filmed in South Korea. Finally, they went to the depths of the cenotes (freshwater caves) of Yucatán, Mexico, to capture images of Chilean dancer Rose Molina Barrios and her free-diving maneuvers in water pierced by the rays of the sun. What these portraits have in common is the dreamlike and evocative beauty of the underwater world, in which everything seems light.