Sea of Tranquility is a short documentary based on archival materials that follow the rise of interest in space missions in various regions of Yugoslavia. Following the path of the first lunar mission, Apollo 11, in 1969, the story of a factory in Croatia that produced batteries and lights unfolds, raising questions about women’s labor and tranquility as a concept of privilege. Who, other than the astronauts who landed at the location Mare Tranquilitatis, had the privilege of contemplating and enjoying the silence?