Recording inside an open air vent inside the two metre-thick wall of the concrete bunker building that forms the Boros Collection. The space has a fascinating past as a shelter, a prison for political prisoners, and a techno and sex club - and now it hosts a conceptual art exhibition. 

The sound captures both the muffled sounds of museum-goers on one side, and the passage of air and the sounds from Berlin outside on the other.

Recorded by Cities and Memory, September 2025.