Alba and Marina have arranged something very special as a present for their father: a dive to a shipwreck. They don't want to miss the moment when he enters the water with the two dive instructors, Oriol and Laia, who will accompany him on this adventure. They watch as the three divers disappear beneath the waves - never imagining that this will be the last time they see them. The sea can be a very dangerous place, at the surface as well as in its depths. Only the most heroic will survive!