An oceanographic ship is a real “floating city”, requiring to bring together a lot of jobs and skills to ensure an efficient coordination every time for the security and the comfort of everyone.During the campaign at sea MAYOBS33, the students of the Floating University had the luck to discover some key activities of the crews who take turns day after day and 24 hours to 24 to ensure their missions. They are introduced here in different forms (stories, interviews, videos…).