Documentary that explores the unknown and mysterious world of whales that appear for a few weeks a year on the Catalan coast. Mar dreams of being able to record the sound of whales, which appear in the Mediterranean only a few weeks a year, depending on circumstances such as the amount of rain and krill, the food on which the whales feed. But when he embarks with a team that investigates cetaceans, Mar realizes that in order to listen to the largest animal in the world we must be silent.

To get through his one-week probationary contract, a young Moroccan plumber must deal with equally eccentric colleagues and customers. Valero, his superior, doubts Moha has what it takes, or that customers will accept a Moroccan worker. Maybe six days is not enough time for someone to overcome their prejudices. But it might be enough to discover that we must live together.

Immersion shows us the fascinating life of aquatic animals that are habitually submerged in the warm waters of a neighborhood pool. People of all ages and conditions do what they can to develop in an environment that, in principle, is not theirs. The film, shot entirely underwater, is a literal immersion into the environment where life originated. A descent into the emotional depths of the individual.