One day, the captain of a cargo ship crossing the Atlantic decides to take a risky act: in violation of his job description, he allows the crew to drop anchor and swim in the open ocean. The sailors frolic and swim with gusto, like children. Only the captain remains on the ship and does not share in the general fun. And then something strange happens... Instead of twenty crew members, twenty-one people return on board. Now the captain has to find out which of them is the odd one out and how he ended up here, in the middle of the endless expanses of the sea. Or did a stranger sneak on board while still in port? The search for answers to questions will accompany the crew throughout the journey. A sea odyssey in a new way. A poetic and metaphorical story about the fragile balance between desire and duty, liberation from routine and the ability to hear your inner voice. An Ultramarine adventure that marks awakening and rebirth.