Method and apparatus for indicating the presence of a buried person in a building after a collapse of the building

The invention relates to a method and an apparatus for indicating the presence of a buried person in a building after collapse of the building, wherein repetitively a signal as for example infrared radiation is monitored by a sensor disposed in or on a housing, and wherein an acceleration of the housing is repetitively measured. While the acceleration of the housing is smaller than a predetermined threshold information indicting the presence of the person is stored and when the measured acceleration of the housing exceeds a certain threshold the stored information is transmitted into the surrounding space.