In about 1959 or 1960, after several larger premises had been divided by partitions, six small rooms were equipped. They were given to Subdivision 2 which secretly listened to private and official conversations. It is not known whether listening equipment was installed in all of these rooms, because part of the equipment was taken away before the museum took over the premises.
Equipment and furniture that has survived is on display in this room, and some of the interiors have been reproduced.