You know how they say that only roughly 10 percent of an iceberg is visible bove the surface? Inés, the nine-year-old Chilean protagonist of  The Meltdown (El Deshielo) , the sophomore feature of actress-turned-writer/director  Manuela Martelli  ( God Will Not Help ,  The Future ), is about to find out the hard way how that concept applies to hidden truths and family trauma. Her parents are away on business – in charge of mounting an iceberg at the 1992 Universal Expo in Seville, which took place under the theme “The Theme of Discovery.” At her grandparents’ remote ski resort hotel in the Andes, the girl befriends German skier Hanna, 15. But then, the skier suddenly vanishes without a trace. Hanna’s mother and Inés team up on the search, filling each other’s family voids. Maya O’Rourke stars as Inés, while Maia Rae Domagala plays Hanna, and Saskia Rosendahl ( Babylon Berlin ) portrays her mother, Lina.…