Music by Andrea Molino, texts and dramaturgy by Guido Barbieri and Ignaz Vergeiner, audio visual documentation by Karl Hoffman. Theatrical it is, but this event is really a multimedia staged concert, that premiered in Germany last March during an international meeting on the environment. The work looks back to the nuclear accident that took place in the nuclear power plant in Three Mile Island in Pennsylvania on 28 March 1997. The research of the Austrian meteorologist Ignaz Vergeiner shows that the radioactive cloud travelled much further than the authorities admitted. The damage to people, objects and the environment was serious and irreversible. Molino's work is based on written and video-recorded contributions by Ignaz Vergeiner, collected by Karl Hoffmann. The "Cloud", an interactive intermedial installation designed by a creative team of the Centre for Arts And Media in Karlsruhe and of the Department of Art & Media of the Zurich University of the Arts, reacts in real time with live performers and provides documentary style, factual information: the voice and face of Vergeiner, the testimonies of the survivors and the interviews with family members of the nuclear accident victims filmed on location.