Could a signal from another world have been kept secret for 40 years? Cloud Chamber is a massively multiplayer game with a formidable history, where players work together to investigate and discuss the media files that we will collect along the journey. Together, the players discover the story of a young scientist who risked their sanity and betrayed his father to save humanity from itself. We have at our disposal a unique story that combines many elements that can carry out our research: emails, photographs, maps, diagrams, feature film and documentary of European Space Agency. We will gain access to hidden parts of history by evaluating the theories of other players. Quite a maze of tests that we go investigating and discussing with other players to discover the truth about this mystery.