The Building 71 Incident

Between 1997 and 1998, building 71, at a university in the south of Brazil, was closed after allegations of a gas leak. However, during this period, on several occasions, suspicious activities were detected from within the building. An employee whose identity was not disclosed, decided to investigate and record the origin of such activities. The man ended up being considered missing by the police, but portions of the recording are now being released to the public.