Have you ever been in one? I visited the one that Norwegian Broadcasting Corporation (NRK) had at Marienlyst in Oslo. This is before I knew anything about anechoic chambers and the sort.
It was called The Dead Room...
The first thing I noticed is that I had to speak a lot louder to be heard. But the most unnerving thing happened when we finally stood still in there.
I could hear my blood run through my own veins.......... So out of sheer panic I started moving and talking again lol.
This room was in the basement, and was secluded from all the other rooms in the building. The control room was even two stories up from the studio. They used it to record special samples that had to be completely "dead," as in no echo or reverberation on it outside the instrument itself. By they looks of it they also used it for Foley recordings, because there was some surfaces in there and some pans of powders and sand.
i worked for a company once with a large (10’ sided cube) and very high-quality anechoic chamber and would go in there on lunch breaks to mediate, was fantastic. (never had audio hallucinations.) i was young and had no hearing issues which probably helped.
