Process and device for controlled ventilation of underground caverns

According to the invention, this problem was solved by the pressure of the cavern atmosphere being set below a minimum outside barometric pressure which occurs and being kept constant regardless of the outside barometric pressure using the gas flows supplied to and taken from the cavern, where one of the two gas flows is kept constant in volume and the other is controlled. The process also permits the use of a cheap small and yet safe waste air cleaning plant, which is also easy to decontaminate and to dismantle. Complete exchange of radioactively contaminated cavern atmosphere by the invention. The very small retention systems only suffer very little radioactivity due to this. (orig./PW)