The last thing Javier, Neilli and Gabriel expect on the day they decide to take a boat to the Fosa de las Caimán, is a storm. All they wanted to do was to check on the state of the coral reefs. But a strange phenomenon occurs, and they find themselves transported to a parallel reality inhabited by incredible creatures. Once there, they meet other humans who, like they, had been trapped in this hostile world known as Oceanum. They include the scientist Edmond who has spent years searching for the way back to Earth, or the warrior Espinosa and his eight beautiful daughters. Life in Oceanum isn't easy, and less so for the new arrivals who want to leave as fast as possible. But how? No-one has ever returned!