ESA astronaut Pablo Álvarez Fernández joins the Advanced Ocean Training Course not as a space explorer, but as a student of the sea. With the Atlantic wind in the sails and scientific instruments in hand, he dives into the world of ocean research – deploying sensors, working with scientists, and embracing the daily rhythm of life at sea. This immersive experience reflects the core challenges of space missions: confined living, close teamwork, and the critical task of collecting data in remote, demanding environments.